/*==================================================
 * 
 * @authors yutent (yutent@doui.cc)
 * @date    2017-03-21 21:05:57
 * support IE10+ and other browsers
 * 
 ==================================================*/

/*********************************************************************
 *                    全局变量及方法                                   *
 **********************************************************************/

var expose = generateID()
//http://stackoverflow.com/questions/7290086/javascript-use-strict-and-nicks-find-global-function
var DOC = window.document
var head = DOC.head //HEAD元素
head.insertAdjacentHTML(
    'afterBegin',
    '<yua :skip class="yua-hide"><style id="yua-style">.yua-hide{ display: none!important } .do-rule-tips {position:absolute;z-index:65535;min-width:75px;height:30px;padding:7px 8px;line-height:16px;color:#333;background:#f9ca05;white-space:pre;} .do-rule-tips::before {position:absolute;left:5px;bottom:-8px;width:0;height:0;border:8px solid transparent;border-left:8px solid #f9ca05;content: " "}</style></yua>'
)
var ifGroup = head.firstChild

function log() {
    // http://stackoverflow.com/questions/8785624/how-to-safely-wrap-console-log
    console.log.apply(console, arguments)
}

/**
 * Creates a new object without a prototype. This object is useful for lookup without having to
 * guard against prototypically inherited properties via hasOwnProperty.
 *
 * Related micro-benchmarks:
 * - http://jsperf.com/object-create2
 * - http://jsperf.com/proto-map-lookup/2
 * - http://jsperf.com/for-in-vs-object-keys2
 */
function createMap() {
    return Object.create(null)
}

var subscribers = '$' + expose

var nullObject = {} //作用类似于noop，只用于代码防御，千万不要在它上面添加属性
var rword = /[^, ]+/g //切割字符串为一个个小块，以空格或豆号分开它们，结合replace实现字符串的forEach
var rw20g = /\w+/g
var rsvg = /^\[object SVG\w*Element\]$/
var oproto = Object.prototype
var ohasOwn = oproto.hasOwnProperty
var serialize = oproto.toString
var ap = Array.prototype
var aslice = ap.slice
var W3C = window.dispatchEvent
var root = DOC.documentElement
var yuaFragment = DOC.createDocumentFragment()
var cinerator = DOC.createElement('div')
var class2type = {
    '[object Boolean]': 'boolean',
    '[object Number]': 'number',
    '[object String]': 'string',
    '[object Function]': 'function',
    '[object Array]': 'array',
    '[object Date]': 'date',
    '[object RegExp]': 'regexp',
    '[object Object]': 'object',
    '[object Error]': 'error',
    '[object AsyncFunction]': 'asyncfunction',
    '[object Promise]': 'promise',
    '[object Generator]': 'generator',
    '[object GeneratorFunction]': 'generatorfunction'
}
var bindingID = 1024
var IEVersion = NaN
if (window.VBArray) {
    IEVersion = document.documentMode || (window.XMLHttpRequest ? 7 : 6)
}

function noop() {}
function scpCompile(array) {
    return Function.apply(noop, array)
}

function oneObject(array, val) {
    if (typeof array === 'string') {
        array = array.match(rword) || []
    }
    var result = {},
        value = val !== void 0 ? val : 1
    for (var i = 0, n = array.length; i < n; i++) {
        result[array[i]] = value
    }
    return result
}

function generateID(mark) {
    mark = (mark && mark + '-') || 'yua-'
    return (
        mark +
        Date.now().toString(16) +
        '-' +
        Math.random()
            .toString(16)
            .slice(2, 6)
    )
}

yua = function(el) {
    //创建jQuery式的无new 实例化结构
    return new yua.init(el)
}

/*视浏览器情况采用最快的异步回调*/
yua.nextTick = new function() {
    // jshint ignore:line
    var tickImmediate = window.setImmediate
    var tickObserver = window.MutationObserver
    if (tickImmediate) {
        return tickImmediate.bind(window)
    }

    var queue = []
    function callback() {
        var n = queue.length
        for (var i = 0; i < n; i++) {
            queue[i]()
        }
        queue = queue.slice(n)
    }

    if (tickObserver) {
        var node = document.createTextNode('yua')
        new tickObserver(callback).observe(node, { characterData: true }) // jshint ignore:line
        var bool = false
        return function(fn) {
            queue.push(fn)
            bool = !bool
            node.data = bool
        }
    }

    return function(fn) {
        setTimeout(fn, 4)
    }
}() // jshint ignore:line

/*********************************************************************
 *                 yua的静态方法定义区                              *
 **********************************************************************/

yua.type = function(obj) {
    //取得目标的类型
    if (obj == null) {
        return String(obj)
    }
    // 早期的webkit内核浏览器实现了已废弃的ecma262v4标准，可以将正则字面量当作函数使用，因此typeof在判定正则时会返回function
    return typeof obj === 'object' || typeof obj === 'function'
        ? class2type[serialize.call(obj)] || 'object'
        : typeof obj
}

/*判定是否是一个朴素的javascript对象（Object），不是DOM对象，不是BOM对象，不是自定义类的实例*/
yua.isPlainObject = function(obj) {
    // 简单的 typeof obj === "object"检测，会致使用isPlainObject(window)在opera下通不过
    return (
        serialize.call(obj) === '[object Object]' &&
        Object.getPrototypeOf(obj) === oproto
    )
}

var VMODELS = (yua.vmodels = {}) //所有vmodel都储存在这里
yua.init = function(source) {
    if (yua.isPlainObject(source)) {
        var $id = source.$id,
            vm
        if (!$id) {
            log('warning: vm必须指定$id')
        }
        vm = modelFactory(source)
        vm.$id = $id
        return (VMODELS[$id] = vm)
    } else {
        this[0] = this.element = source
    }
}
yua.fn = yua.prototype = yua.init.prototype

//与jQuery.extend方法，可用于浅拷贝，深拷贝
yua.mix = yua.fn.mix = function() {
    var options,
        name,
        src,
        copy,
        copyIsArray,
        clone,
        target = arguments[0] || {},
        i = 1,
        length = arguments.length,
        deep = false

    // 如果第一个参数为布尔,判定是否深拷贝
    if (typeof target === 'boolean') {
        deep = target
        target = arguments[1] || {}
        i++
    }

    //确保接受方为一个复杂的数据类型
    if (typeof target !== 'object' && yua.type(target) !== 'function') {
        target = {}
    }

    //如果只有一个参数，那么新成员添加于mix所在的对象上
    if (i === length) {
        target = this
        i--
    }

    for (; i < length; i++) {
        //只处理非空参数
        if ((options = arguments[i]) != null) {
            for (name in options) {
                src = target[name]
                copy = options[name]
                // 防止环引用
                if (target === copy) {
                    continue
                }
                if (
                    deep &&
                    copy &&
                    (yua.isPlainObject(copy) ||
                        (copyIsArray = Array.isArray(copy)))
                ) {
                    if (copyIsArray) {
                        copyIsArray = false
                        clone = src && Array.isArray(src) ? src : []
                    } else {
                        clone = src && yua.isPlainObject(src) ? src : {}
                    }

                    target[name] = yua.mix(deep, clone, copy)
                } else if (copy !== void 0) {
                    target[name] = copy
                }
            }
        }
    }
    return target
}

/*-----------------部分ES6的JS实现 start---------------*/

if (!Object.assign) {
    Object.defineProperty(Object, 'assign', {
        enumerable: false,
        value: function(target, first) {
            'use strict'
            if (target === undefined || target === null)
                throw new TypeError('Can not convert first argument to object')

            var to = Object(target)
            for (var i = 0, len = arguments.length; i < len; i++) {
                var next = arguments[i]
                if (next === undefined || next === null) continue

                var keys = Object.keys(Object(next))
                for (var j = 0, n = keys.length; j < n; j++) {
                    var key = keys[j]
                    var desc = Object.getOwnPropertyDescriptor(next, key)
                    if (desc !== undefined && desc.enumerable)
                        to[key] = next[key]
                }
            }
            return to
        }
    })
}

if (!Array.from) {
    Object.defineProperty(Array, 'from', {
        enumerable: false,
        value: (function() {
            var toStr = Object.prototype.toString
            var isCallable = function(fn) {
                return (
                    typeof fn === 'function' ||
                    toStr.call(fn) === '[object Function]'
                )
            }

            var toInt = function(val) {
                var num = val - 0
                if (isNaN(num)) return 0

                if (num === 0 || isFinite(num)) return num

                return (num > 0 ? 1 : -1) * Math.floor(Math.abs(num))
            }
            var maxInt = Math.pow(2, 53) - 1
            var toLen = function(val) {
                var len = toInt(val)
                return Math.min(Math.max(len, 0), maxInt)
            }

            return function(arrLike) {
                var _this = this
                var items = Object(arrLike)
                if (arrLike === null)
                    throw new TypeError(
                        'Array.from requires an array-like object - not null or undefined'
                    )

                var mapFn = arguments.length > 1 ? arguments[1] : undefined
                var other
                if (mapFn !== undefined) {
                    if (!isCallable(mapFn))
                        throw new TypeError(
                            'Array.from: when provided, the second argument must be a function'
                        )

                    if (arguments.length > 2) other = arguments[2]
                }

                var len = toLen(items.length)
                var arr = isCallable(_this)
                    ? Object(new _this(len))
                    : new Array(len)
                var k = 0
                var kVal
                while (k < len) {
                    kVal = items[k]
                    if (mapFn)
                        arr[k] =
                            other === 'undefined'
                                ? mapFn(kVal, k)
                                : mapFn.call(other, kVal, k)
                    else arr[k] = kVal

                    k++
                }
                arr.length = len
                return arr
            }
        })()
    })
}

// 判断数组是否包含指定元素
if (!Array.prototype.includes) {
    Object.defineProperty(Array.prototype, 'includes', {
        value: function(val) {
            for (var i in this) {
                if (this[i] === val) return true
            }
            return false
        },
        enumerable: false
    })
}

//类似于Array 的splice方法
if (!String.prototype.splice) {
    Object.defineProperty(String.prototype, 'splice', {
        value: function(start, len, fill) {
            var length = this.length,
                argLen = arguments.length

            fill = fill === undefined ? '' : fill

            if (argLen < 1) {
                return this
            }

            //处理负数
            if (start < 0) {
                if (Math.abs(start) >= length) start = 0
                else start = length + start
            }

            if (argLen === 1) {
                return this.slice(0, start)
            } else {
                len -= 0

                var strl = this.slice(0, start),
                    strr = this.slice(start + len)

                return strl + fill + strr
            }
        },
        enumerable: false
    })
}

if (!Date.prototype.getFullWeek) {
    //获取当天是本年度第几周
    Object.defineProperty(Date.prototype, 'getFullWeek', {
        value: function() {
            var thisYear = this.getFullYear(),
                that = new Date(thisYear, 0, 1),
                firstDay = that.getDay(),
                numsOfToday = (this - that) / 86400000
            return Math.ceil((numsOfToday + firstDay) / 7)
        },
        enumerable: false
    })

    //获取当天是本月第几周
    Object.defineProperty(Date.prototype, 'getWeek', {
        value: function() {
            var today = this.getDate(),
                thisMonth = this.getMonth(),
                thisYear = this.getFullYear(),
                firstDay = new Date(thisYear, thisMonth, 1).getDay()
            return Math.ceil((today + firstDay) / 7)
        },
        enumerable: false
    })
}

if (!Date.isDate) {
    Object.defineProperty(Date, 'isDate', {
        value: function(obj) {
            return typeof obj === 'object' && obj.getTime ? true : false
        },
        enumerable: false
    })
}

//时间格式化
if (!Date.prototype.format) {
    Object.defineProperty(Date.prototype, 'format', {
        value: function(str) {
            str = str || 'Y-m-d H:i:s'
            var week = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
                dt = {
                    fullyear: this.getFullYear(),
                    year: this.getYear(),
                    fullweek: this.getFullWeek(),
                    week: this.getWeek(),
                    month: this.getMonth() + 1,
                    date: this.getDate(),
                    day: week[this.getDay()],
                    hours: this.getHours(),
                    minutes: this.getMinutes(),
                    seconds: this.getSeconds()
                },
                re

            dt.g = dt.hours > 12 ? dt.hours - 12 : dt.hours

            re = {
                Y: dt.fullyear,
                y: dt.year,
                m: dt.month < 10 ? '0' + dt.month : dt.month,
                n: dt.month,
                d: dt.date < 10 ? '0' + dt.date : dt.date,
                j: dt.date,
                H: dt.hours < 10 ? '0' + dt.hours : dt.hours,
                h: dt.g < 10 ? '0' + dt.g : dt.g,
                G: dt.hours,
                g: dt.g,
                i: dt.minutes < 10 ? '0' + dt.minutes : dt.minutes,
                s: dt.seconds < 10 ? '0' + dt.seconds : dt.seconds,
                W: dt.fullweek,
                w: dt.week,
                D: dt.day
            }

            for (var i in re) {
                str = str.replace(new RegExp(i, 'g'), re[i])
            }
            return str
        },
        enumerable: false
    })
}

/*-----------------部分ES6的JS实现 ending---------------*/

yua.mix({
    rword: rword,
    subscribers: subscribers,
    version: '1.0.0',
    log: log,
    ui: {}, //仅用于存放组件版本信息等
    slice: function(nodes, start, end) {
        return aslice.call(nodes, start, end)
    },
    noop: noop,
    /*如果不用Error对象封装一下，str在控制台下可能会乱码*/
    error: function(str, e) {
        throw new (e || Error)(str) // jshint ignore:line
    },
    /* yua.range(10)
     => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
     yua.range(1, 11)
     => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
     yua.range(0, 30, 5)
     => [0, 5, 10, 15, 20, 25]
     yua.range(0, -10, -1)
     => [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
     yua.range(0)
     => []*/
    range: function(start, end, step) {
        // 用于生成整数数组
        step || (step = 1)
        if (end == null) {
            end = start || 0
            start = 0
        }
        var index = -1,
            length = Math.max(0, Math.ceil((end - start) / step)),
            result = new Array(length)
        while (++index < length) {
            result[index] = start
            start += step
        }
        return result
    },
    deepCopy: toJson,
    eventHooks: {},
    /*绑定事件*/
    bind: function(el, type, fn, phase) {
        var hooks = yua.eventHooks
        type = type.split(',')
        yua.each(type, function(i, t) {
            t = t.trim()
            var hook = hooks[t]
            if (typeof hook === 'object') {
                type = hook.type || type
                phase = hook.phase || !!phase
                fn = hook.fix ? hook.fix(el, fn) : fn
            }
            el.addEventListener(t, fn, phase)
        })
        return fn
    },
    /*卸载事件*/
    unbind: function(el, type, fn, phase) {
        var hooks = yua.eventHooks
        type = type.split(',')
        fn = fn || noop
        yua.each(type, function(i, t) {
            t = t.trim()
            var hook = hooks[t]
            if (typeof hook === 'object') {
                type = hook.type || type
                phase = hook.phase || !!phase
            }
            el.removeEventListener(t, fn, phase)
        })
    },
    /*读写删除元素节点的样式*/
    css: function(node, name, value) {
        if (node instanceof yua) {
            node = node[0]
        }
        var prop = /[_-]/.test(name) ? camelize(name) : name,
            fn
        name = yua.cssName(prop) || prop
        if (value === void 0 || typeof value === 'boolean') {
            //获取样式
            fn = cssHooks[prop + ':get'] || cssHooks['@:get']
            if (name === 'background') {
                name = 'backgroundColor'
            }
            var val = fn(node, name)
            return value === true ? parseFloat(val) || 0 : val
        } else if (value === '') {
            //请除样式
            node.style[name] = ''
        } else {
            //设置样式
            if (value == null || value !== value) {
                return
            }
            if (isFinite(value) && !yua.cssNumber[prop]) {
                value += 'px'
            }
            fn = cssHooks[prop + ':set'] || cssHooks['@:set']
            fn(node, name, value)
        }
    },
    /*遍历数组与对象,回调的第一个参数为索引或键名,第二个或元素或键值*/
    each: function(obj, fn) {
        if (obj) {
            //排除null, undefined
            var i = 0
            if (isArrayLike(obj)) {
                for (var n = obj.length; i < n; i++) {
                    if (fn(i, obj[i]) === false) break
                }
            } else {
                for (i in obj) {
                    if (obj.hasOwnProperty(i) && fn(i, obj[i]) === false) {
                        break
                    }
                }
            }
        }
    },
    Array: {
        /*只有当前数组不存在此元素时只添加它*/
        ensure: function(target, item) {
            if (target.indexOf(item) === -1) {
                return target.push(item)
            }
        },
        /*移除数组中指定位置的元素，返回布尔表示成功与否*/
        removeAt: function(target, index) {
            return !!target.splice(index, 1).length
        },
        /*移除数组中第一个匹配传参的那个元素，返回布尔表示成功与否*/
        remove: function(target, item) {
            var index = target.indexOf(item)
            if (~index) return yua.Array.removeAt(target, index)
            return false
        }
    },
    /**
     * [ls localStorage操作]
     * @param  {[type]} name  [键名]
     * @param  {[type]} val [键值，为空时删除]
     * @return
     */
    ls: function(name, val) {
        if (!window.localStorage)
            return log('该浏览器不支持本地储存localStorage')

        if (this.type(name) === 'object') {
            for (var i in name) {
                localStorage.setItem(i, name[i])
            }
            return
        }
        switch (arguments.length) {
            case 1:
                return localStorage.getItem(name)
            default:
                if (
                    (this.type(val) == 'string' && val.trim() === '') ||
                    val === null
                ) {
                    localStorage.removeItem(name)
                    return
                }
                if (this.type(val) !== 'object' && this.type(val) !== 'array') {
                    localStorage.setItem(name, val.toString())
                } else {
                    localStorage.setItem(name, JSON.stringify(val))
                }
        }
    },
    /**
     * [cookie cookie 操作 ]
     * @param  name  [cookie名]
     * @param  value [cookie值]
     * @param  {[json]} opt   [有效期，域名，路径等]
     * @return {[boolean]}       [读取时返回对应的值，写入时返回true]
     */
    cookie: function(name, value, opt) {
        if (arguments.length > 1) {
            if (!name) return

            //设置默认的参数
            opt = opt || {}
            opt = this.mix(
                { expires: '', path: '/', domain: document.domain, secure: '' },
                opt
            )

            if (!value) {
                document.cookie =
                    encodeURIComponent(name) +
                    '=; expires=Thu, 01 Jan 1970 00:00:00 GMT; domain=' +
                    opt.domain +
                    '; path=' +
                    opt.path
                return true
            }
            if (opt.expires) {
                switch (opt.expires.constructor) {
                    case Number:
                        opt.expires =
                            opt.expires === Infinity
                                ? '; expires=Fri, 31 Dec 9999 23:59:59 GMT'
                                : '; max-age=' + opt.expires
                        break
                    case String:
                        opt.expires = '; expires=' + opt.expires
                        break
                    case Date:
                        opt.expires = '; expires=' + opt.expires.toUTCString()
                        break
                }
            }
            document.cookie =
                encodeURIComponent(name) +
                '=' +
                encodeURIComponent(value) +
                opt.expires +
                '; domain=' +
                opt.domain +
                '; path=' +
                opt.path +
                '; ' +
                opt.secure
            return true
        } else {
            if (!name) {
                var keys = document.cookie
                    .replace(
                        /((?:^|\s*;)[^\=]+)(?=;|$)|^\s*|\s*(?:\=[^;]*)?(?:\1|$)/g,
                        ''
                    )
                    .split(/\s*(?:\=[^;]*)?;\s*/)
                for (var i = 0, len = keys.length; i < len; i++) {
                    keys[i] = decodeURIComponent(keys[i])
                }
                return keys
            }
            return (
                decodeURIComponent(
                    document.cookie.replace(
                        new RegExp(
                            '(?:(?:^|.*;)\\s*' +
                                encodeURIComponent(name).replace(
                                    /[\-\.\+\*]/g,
                                    '\\$&'
                                ) +
                                '\\s*\\=\\s*([^;]*).*$)|^.*$'
                        ),
                        '$1'
                    )
                ) || null
            )
        }
    },
    //获取url的参数
    search: function(key) {
        key += ''
        var uri = location.search

        if (!key || !uri) return null

        uri = uri.slice(1)
        uri = uri.split('&')

        var obj = {}
        for (var i in uri) {
            var item = uri[i]
            var tmp = item.split('=')
            tmp[1] = tmp.length < 2 ? null : tmp[1]
            tmp[1] = decodeURIComponent(tmp[1])
            if (obj.hasOwnProperty(tmp[0])) {
                if (typeof obj[tmp[0]] === 'object') {
                    obj[tmp[0]].push(tmp[1])
                } else {
                    obj[tmp[0]] = [obj[tmp[0]]]
                    obj[tmp[0]].push(tmp[1])
                }
            } else {
                obj[tmp[0]] = tmp[1]
            }
        }
        return obj.hasOwnProperty(key) ? obj[key] : null
    },
    //复制文本到粘贴板
    copy: function(txt) {
        if (!DOC.queryCommandSupported || !DOC.queryCommandSupported('copy'))
            return log('该浏览器不支持复制到粘贴板')

        var ta = DOC.createElement('textarea')
        ta.textContent = txt
        ta.style.position = 'fixed'
        ta.style.bottom = '-1000px'
        DOC.body.appendChild(ta)
        ta.select()
        try {
            DOC.execCommand('copy')
        } catch (err) {
            log('复制到粘贴板失败')
        }
        DOC.body.removeChild(ta)
    }
})

var bindingHandlers = (yua.bindingHandlers = {})
var bindingExecutors = (yua.bindingExecutors = {})

var directives = (yua.directives = {})
yua.directive = function(name, obj) {
    bindingHandlers[name] = obj.init = obj.init || noop
    bindingExecutors[name] = obj.update = obj.update || noop
    return (directives[name] = obj)
}

/*判定是否类数组，如节点集合，纯数组，arguments与拥有非负整数的length属性的纯JS对象*/
function isArrayLike(obj) {
    if (obj && typeof obj === 'object') {
        var n = obj.length,
            str = serialize.call(obj)
        if (/(Array|List|Collection|Map|Arguments)\]$/.test(str)) {
            return true
        } else if (str === '[object Object]' && n === n >>> 0) {
            return true //由于ecma262v5能修改对象属性的enumerable，因此不能用propertyIsEnumerable来判定了
        }
    }
    return false
}

// https://github.com/rsms/js-lru
var Cache = new function() {
    // jshint ignore:line
    function LRU(maxLength) {
        this.size = 0
        this.limit = maxLength
        this.head = this.tail = void 0
        this._keymap = {}
    }

    var p = LRU.prototype

    p.put = function(key, value) {
        var entry = {
            key: key,
            value: value
        }
        this._keymap[key] = entry
        if (this.tail) {
            this.tail.newer = entry
            entry.older = this.tail
        } else {
            this.head = entry
        }
        this.tail = entry
        if (this.size === this.limit) {
            this.shift()
        } else {
            this.size++
        }
        return value
    }

    p.shift = function() {
        var entry = this.head
        if (entry) {
            this.head = this.head.newer
            this.head.older = entry.newer = entry.older = this._keymap[
                entry.key
            ] = void 0
            delete this._keymap[entry.key] //#1029
        }
    }
    p.get = function(key) {
        var entry = this._keymap[key]
        if (entry === void 0) return
        if (entry === this.tail) {
            return entry.value
        }
        // HEAD--------------TAIL
        //   <.older   .newer>
        //  <--- add direction --
        //   A  B  C  <D>  E
        if (entry.newer) {
            if (entry === this.head) {
                this.head = entry.newer
            }
            entry.newer.older = entry.older // C <-- E.
        }
        if (entry.older) {
            entry.older.newer = entry.newer // C. --> E
        }
        entry.newer = void 0 // D --x
        entry.older = this.tail // D. --> E
        if (this.tail) {
            this.tail.newer = entry // E. <-- D
        }
        this.tail = entry
        return entry.value
    }
    return LRU
}() // jshint ignore:line

/*********************************************************************
 *                           DOM 底层补丁                             *
 **********************************************************************/

//safari5+是把contains方法放在Element.prototype上而不是Node.prototype
if (!DOC.contains) {
    Node.prototype.contains = function(arg) {
        return !!(this.compareDocumentPosition(arg) & 16)
    }
}
yua.contains = function(root, el) {
    try {
        while ((el = el.parentNode)) if (el === root) return true
        return false
    } catch (e) {
        return false
    }
}

if (window.SVGElement) {
    var svgns = 'http://www.w3.org/2000/svg'
    var svg = DOC.createElementNS(svgns, 'svg')
    svg.innerHTML = '<circle cx="50" cy="50" r="40" fill="red" />'
    if (!rsvg.test(svg.firstChild)) {
        // #409
        /* jshint ignore:start */
        function enumerateNode(node, targetNode) {
            if (node && node.childNodes) {
                var nodes = node.childNodes
                for (var i = 0, el; (el = nodes[i++]); ) {
                    if (el.tagName) {
                        var svg = DOC.createElementNS(
                            svgns,
                            el.tagName.toLowerCase()
                        )
                        // copy attrs
                        ap.forEach.call(el.attributes, function(attr) {
                            svg.setAttribute(attr.name, attr.value)
                        })
                        // 递归处理子节点
                        enumerateNode(el, svg)
                        targetNode.appendChild(svg)
                    }
                }
            }
        }
        /* jshint ignore:end */
        Object.defineProperties(SVGElement.prototype, {
            outerHTML: {
                //IE9-11,firefox不支持SVG元素的innerHTML,outerHTML属性
                enumerable: true,
                configurable: true,
                get: function() {
                    return new XMLSerializer().serializeToString(this)
                },
                set: function(html) {
                    var tagName = this.tagName.toLowerCase(),
                        par = this.parentNode,
                        frag = yua.parseHTML(html)
                    // 操作的svg，直接插入
                    if (tagName === 'svg') {
                        par.insertBefore(frag, this)
                        // svg节点的子节点类似
                    } else {
                        var newFrag = DOC.createDocumentFragment()
                        enumerateNode(frag, newFrag)
                        par.insertBefore(newFrag, this)
                    }
                    par.removeChild(this)
                }
            },
            innerHTML: {
                enumerable: true,
                configurable: true,
                get: function() {
                    var s = this.outerHTML
                    var ropen = new RegExp(
                        '<' +
                            this.nodeName +
                            '\\b(?:(["\'])[^"]*?(\\1)|[^>])*>',
                        'i'
                    )
                    var rclose = new RegExp('</' + this.nodeName + '>$', 'i')
                    return s.replace(ropen, '').replace(rclose, '')
                },
                set: function(html) {
                    if (yua.clearHTML) {
                        yua.clearHTML(this)
                        var frag = yua.parseHTML(html)
                        enumerateNode(frag, this)
                    }
                }
            }
        })
    }
}

//========================= event binding ====================

var eventHooks = yua.eventHooks

//针对firefox, chrome修正mouseenter, mouseleave(chrome30+)
if (!('onmouseenter' in root)) {
    yua.each(
        {
            mouseenter: 'mouseover',
            mouseleave: 'mouseout'
        },
        function(origType, fixType) {
            eventHooks[origType] = {
                type: fixType,
                fix: function(elem, fn) {
                    return function(e) {
                        var t = e.relatedTarget
                        if (
                            !t ||
                            (t !== elem &&
                                !(elem.compareDocumentPosition(t) & 16))
                        ) {
                            delete e.type
                            e.type = origType
                            return fn.call(elem, e)
                        }
                    }
                }
            }
        }
    )
}

//针对IE9+, w3c修正animationend
yua.each(
    {
        AnimationEvent: 'animationend',
        WebKitAnimationEvent: 'webkitAnimationEnd'
    },
    function(construct, fixType) {
        if (window[construct] && !eventHooks.animationend) {
            eventHooks.animationend = {
                type: fixType
            }
        }
    }
)

if (DOC.onmousewheel === void 0) {
    /* IE6-11 chrome mousewheel wheelDetla 下 -120 上 120
     firefox DOMMouseScroll detail 下3 上-3
     firefox wheel detlaY 下3 上-3
     IE9-11 wheel deltaY 下40 上-40
     chrome wheel deltaY 下100 上-100 */
    eventHooks.mousewheel = {
        type: 'wheel',
        fix: function(elem, fn) {
            return function(e) {
                e.wheelDeltaY = e.wheelDelta = e.deltaY > 0 ? -120 : 120
                e.wheelDeltaX = 0
                Object.defineProperty(e, 'type', {
                    value: 'mousewheel'
                })
                fn.call(elem, e)
            }
        }
    }
}

/*********************************************************************
 *                           配置系统                                 *
 **********************************************************************/

function kernel(settings) {
    for (var p in settings) {
        if (!ohasOwn.call(settings, p)) continue
        var val = settings[p]
        if (typeof kernel.plugins[p] === 'function') {
            kernel.plugins[p](val)
        } else if (typeof kernel[p] === 'object') {
            yua.mix(kernel[p], val)
        } else {
            kernel[p] = val
        }
    }
    return this
}
yua.config = kernel

var openTag,
    closeTag,
    rexpr,
    rexprg,
    rbind,
    rregexp = /[-.*+?^${}()|[\]\/\\]/g

function escapeRegExp(target) {
    //http://stevenlevithan.com/regex/xregexp/
    //将字符串安全格式化为正则表达式的源码
    return (target + '').replace(rregexp, '\\$&')
}

var plugins = {
    interpolate: function(array) {
        openTag = array[0]
        closeTag = array[1]
        if (openTag === closeTag) {
            throw new SyntaxError('openTag!==closeTag')
            var test = openTag + 'test' + closeTag
            cinerator.innerHTML = test
            if (
                cinerator.innerHTML !== test &&
                cinerator.innerHTML.indexOf('&lt;') > -1
            ) {
                throw new SyntaxError('此定界符不合法')
            }
            cinerator.innerHTML = ''
        }
        kernel.openTag = openTag
        kernel.closeTag = closeTag
        var o = escapeRegExp(openTag),
            c = escapeRegExp(closeTag)
        rexpr = new RegExp(o + '([\\s\\S]*)' + c)
        rexprg = new RegExp(o + '([\\s\\S]*)' + c, 'g')
        rbind = new RegExp(o + '[\\s\\S]*' + c + '|\\s:') //此处有疑问
    }
}
kernel.plugins = plugins
kernel.plugins['interpolate'](['{{', '}}'])

kernel.async = true
kernel.paths = {}
kernel.shim = {}
kernel.maxRepeatSize = 100

function $watch(expr, binding) {
    var $events = this.$events || (this.$events = {}),
        queue = $events[expr] || ($events[expr] = [])

    if (typeof binding === 'function') {
        var backup = binding
        backup.uuid = '_' + ++bindingID
        binding = {
            element: root,
            type: 'user-watcher',
            handler: noop,
            vmodels: [this],
            expr: expr,
            uuid: backup.uuid
        }
        binding.wildcard = /\*/.test(expr)
    }

    if (!binding.update) {
        if (/\w\.*\B/.test(expr) || expr === '*') {
            binding.getter = noop
            var host = this
            binding.update = function() {
                var args = this.fireArgs || []
                if (args[2]) binding.handler.apply(host, args)
                delete this.fireArgs
            }
            queue.sync = true
            yua.Array.ensure(queue, binding)
        } else {
            yua.injectBinding(binding)
        }
        if (backup) {
            binding.handler = backup
        }
    } else if (!binding.oneTime) {
        yua.Array.ensure(queue, binding)
    }

    return function() {
        binding.update = binding.getter = binding.handler = noop
        binding.element = DOC.createElement('a')
    }
}

function $emit(key, args) {
    var event = this.$events
    if (event && event[key]) {
        if (args) {
            args[2] = key
        }
        var arr = event[key]
        notifySubscribers(arr, args)
        if (args && event['*'] && !/\./.test(key)) {
            for (var sub, k = 0; (sub = event['*'][k++]); ) {
                try {
                    sub.handler.apply(this, args)
                } catch (e) {}
            }
        }
        var parent = this.$up
        if (parent) {
            if (this.$pathname) {
                $emit.call(parent, this.$pathname + '.' + key, args) //以确切的值往上冒泡
            }
            $emit.call(parent, '*.' + key, args) //以模糊的值往上冒泡
        }
    } else {
        parent = this.$up
        if (this.$ups) {
            for (var i in this.$ups) {
                $emit.call(this.$ups[i], i + '.' + key, args) //以确切的值往上冒泡
            }
            return
        }
        if (parent) {
            var p = this.$pathname
            if (p === '') p = '*'
            var path = p + '.' + key
            arr = path.split('.')

            args = (args && args.concat([path, key])) || [path, key]

            if (arr.indexOf('*') === -1) {
                $emit.call(parent, path, args) //以确切的值往上冒泡
                arr[1] = '*'
                $emit.call(parent, arr.join('.'), args) //以模糊的值往上冒泡
            } else {
                $emit.call(parent, path, args) //以确切的值往上冒泡
            }
        }
    }
}

function collectDependency(el, key) {
    do {
        if (el.$watch) {
            var e = el.$events || (el.$events = {})
            var array = e[key] || (e[key] = [])
            dependencyDetection.collectDependency(array)
            return
        }
        el = el.$up
        if (el) {
            key = el.$pathname + '.' + key
        } else {
            break
        }
    } while (true)
}

function notifySubscribers(subs, args) {
    if (!subs) return
    if (new Date() - beginTime > 444 && typeof subs[0] === 'object') {
        rejectDisposeQueue()
    }
    var users = [],
        renders = []
    for (var i = 0, sub; (sub = subs[i++]); ) {
        if (sub.type === 'user-watcher') {
            users.push(sub)
        } else {
            renders.push(sub)
        }
    }
    if (kernel.async) {
        buffer.render() //1
        for (i = 0; (sub = renders[i++]); ) {
            if (sub.update) {
                sub.uuid = sub.uuid || '_' + ++bindingID
                var uuid = sub.uuid
                if (!buffer.queue[uuid]) {
                    buffer.queue[uuid] = '__'
                    buffer.queue.push(sub)
                }
            }
        }
    } else {
        for (i = 0; (sub = renders[i++]); ) {
            if (sub.update) {
                sub.update() //最小化刷新DOM树
            }
        }
    }
    for (i = 0; (sub = users[i++]); ) {
        if ((args && args[2] === sub.expr) || sub.wildcard) {
            sub.fireArgs = args
        }
        sub.update()
    }
}

//一些不需要被监听的属性
var $$skipArray = oneObject(
    '$id,$watch,$fire,$events,$model,$skipArray,$active,$pathname,$up,$ups,$track,$accessors'
)

//如果浏览器不支持ecma262v5的Object.defineProperties或者存在BUG，比如IE8
//标准浏览器使用__defineGetter__, __defineSetter__实现

function modelFactory(source, options) {
    options = options || {}
    options.watch = true
    return observeObject(source, options)
}

//监听对象属性值的变化(注意,数组元素不是数组的属性),通过对劫持当前对象的访问器实现
//监听对象或数组的结构变化, 对对象的键值对进行增删重排, 或对数组的进行增删重排,都属于这范畴
//   通过比较前后代理VM顺序实现
function Component() {}

function observeObject(source, options) {
    if (
        !source ||
        (source.$id && source.$accessors) ||
        (source.nodeName && source.nodeType > 0)
    ) {
        return source
    }
    //source为原对象,不能是元素节点或null
    //options,可选,配置对象,里面有old, force, watch这三个属性
    options = options || nullObject
    var force = options.force || nullObject
    var old = options.old
    var oldAccessors = (old && old.$accessors) || nullObject
    var $vmodel = new Component() //要返回的对象, 它在IE6-8下可能被偷龙转凤
    var accessors = {} //监控属性
    var hasOwn = {}
    var skip = []
    var simple = []
    var $skipArray = {}
    if (source.$skipArray) {
        $skipArray = oneObject(source.$skipArray)
        delete source.$skipArray
    }
    //处理计算属性
    var computed = source.$computed
    if (computed) {
        delete source.$computed
        for (var name in computed) {
            hasOwn[name] = true
            ;(function(key, value) {
                var old
                if (typeof value === 'function') {
                    value = { get: value, set: noop }
                }
                if (typeof value.set !== 'function') {
                    value.set = noop
                }
                accessors[key] = {
                    get: function() {
                        return (old = value.get.call(this))
                    },
                    set: function(x) {
                        var older = old,
                            newer
                        value.set.call(this, x)
                        newer = this[key]
                        if (this.$fire && newer !== older) {
                            this.$fire(key, newer, older)
                        }
                    },
                    enumerable: true,
                    configurable: true
                }
            })(name, computed[name]) // jshint ignore:line
        }
    }

    for (name in source) {
        var value = source[name]
        if (!$$skipArray[name]) hasOwn[name] = true
        if (
            typeof value === 'function' ||
            (value && value.nodeName && value.nodeType > 0) ||
            (!force[name] &&
                (name.charAt(0) === '$' ||
                    $$skipArray[name] ||
                    $skipArray[name]))
        ) {
            skip.push(name)
        } else if (isComputed(value)) {
            log('warning:计算属性建议放在$computed对象中统一定义')
            ;(function(key, value) {
                var old
                if (typeof value === 'function') {
                    value = { get: value, set: noop }
                }
                if (typeof value.set !== 'function') {
                    value.set = noop
                }
                accessors[key] = {
                    get: function() {
                        return (old = value.get.call(this))
                    },
                    set: function(x) {
                        var older = old,
                            newer
                        value.set.call(this, x)
                        newer = this[key]
                        if (this.$fire && newer !== older) {
                            this.$fire(key, newer, older)
                        }
                    },
                    enumerable: true,
                    configurable: true
                }
            })(name, value) // jshint ignore:line
        } else {
            simple.push(name)
            if (oldAccessors[name]) {
                accessors[name] = oldAccessors[name]
            } else {
                accessors[name] = makeGetSet(name, value)
            }
        }
    }

    accessors['$model'] = $modelDescriptor
    $vmodel = Object.defineProperties($vmodel, accessors, source)
    function trackBy(name) {
        return hasOwn[name] === true
    }
    skip.forEach(function(name) {
        $vmodel[name] = source[name]
    })

    /* jshint ignore:start */
    hideProperty($vmodel, '$ups', null)
    hideProperty($vmodel, '$id', 'anonymous')
    hideProperty($vmodel, '$up', old ? old.$up : null)
    hideProperty($vmodel, '$track', Object.keys(hasOwn))
    hideProperty($vmodel, '$active', false)
    hideProperty($vmodel, '$pathname', old ? old.$pathname : '')
    hideProperty($vmodel, '$accessors', accessors)
    hideProperty($vmodel, 'hasOwnProperty', trackBy)
    if (options.watch) {
        hideProperty($vmodel, '$watch', function() {
            return $watch.apply($vmodel, arguments)
        })
        hideProperty($vmodel, '$fire', function(path, a) {
            if (path.indexOf('all!') === 0) {
                var ee = path.slice(4)
                for (var i in yua.vmodels) {
                    var v = yua.vmodels[i]
                    v.$fire && v.$fire.apply(v, [ee, a])
                }
            } else {
                $emit.call($vmodel, path, [a])
            }
        })
    }
    /* jshint ignore:end */

    //必须设置了$active,$events
    simple.forEach(function(name) {
        var oldVal = old && old[name]
        var val = ($vmodel[name] = source[name])
        if (val && typeof val === 'object') {
            val.$up = $vmodel
            val.$pathname = name
        }
        $emit.call($vmodel, name, [val, oldVal])
    })
    for (name in computed) {
        value = $vmodel[name]
    }
    $vmodel.$active = true

    return $vmodel
}

/*
 新的VM拥有如下私有属性
 $id: vm.id
 $events: 放置$watch回调与绑定对象
 $watch: 增强版$watch
 $fire: 触发$watch回调
 $track:一个数组,里面包含用户定义的所有键名
 $active:boolean,false时防止依赖收集
 $model:返回一个纯净的JS对象
 $accessors:放置所有读写器的数据描述对象
 $up:返回其上级对象
 $pathname:返回此对象在上级对象的名字,注意,数组元素的$pathname为空字符串
 =============================
 $skipArray:用于指定不可监听的属性,但VM生成是没有此属性的
 */
function isComputed(val) {
    //speed up!
    if (val && typeof val === 'object') {
        for (var i in val) {
            if (i !== 'get' && i !== 'set') {
                return false
            }
        }
        return typeof val.get === 'function'
    }
}
function makeGetSet(key, value) {
    var childVm,
        value = NaN
    return {
        get: function() {
            if (this.$active) {
                collectDependency(this, key)
            }
            return value
        },
        set: function(newVal) {
            if (value === newVal) return
            var oldValue = value
            childVm = observe(newVal, value)
            if (childVm) {
                value = childVm
            } else {
                childVm = void 0
                value = newVal
            }

            if (Object(childVm) === childVm) {
                childVm.$pathname = key
                childVm.$up = this
            }
            if (this.$active) {
                $emit.call(this, key, [value, oldValue])
            }
        },
        enumerable: true,
        configurable: true
    }
}

function observe(obj, old, hasReturn, watch) {
    if (Array.isArray(obj)) {
        return observeArray(obj, old, watch)
    } else if (yua.isPlainObject(obj)) {
        if (old && typeof old === 'object') {
            var keys = Object.keys(obj)
            var keys2 = Object.keys(old)
            if (keys.join(';') === keys2.join(';')) {
                for (var i in obj) {
                    if (obj.hasOwnProperty(i)) {
                        old[i] = obj[i]
                    }
                }
                return old
            }
            old.$active = false
        }
        return observeObject(obj, {
            old: old,
            watch: watch
        })
    }
    if (hasReturn) {
        return obj
    }
}

function observeArray(array, old, watch) {
    if (old && old.splice) {
        var args = [0, old.length].concat(array)
        old.splice.apply(old, args)
        return old
    } else {
        for (var i in newProto) {
            array[i] = newProto[i]
        }
        hideProperty(array, '$up', null)
        hideProperty(array, '$pathname', '')
        hideProperty(array, '$track', createTrack(array.length))

        array._ = observeObject(
            {
                length: NaN
            },
            {
                watch: true
            }
        )
        array._.length = array.length
        array._.$watch('length', function(a, b) {
            $emit.call(array.$up, array.$pathname + '.length', [a, b])
        })
        if (watch) {
            hideProperty(array, '$watch', function() {
                return $watch.apply(array, arguments)
            })
        }

        Object.defineProperty(array, '$model', $modelDescriptor)

        for (var j = 0, n = array.length; j < n; j++) {
            var el = (array[j] = observe(array[j], 0, 1, 1))
            if (Object(el) === el) {
                //#1077
                el.$up = array
            }
        }

        return array
    }
}

function hideProperty(host, name, value) {
    Object.defineProperty(host, name, {
        value: value,
        writable: true,
        enumerable: false,
        configurable: true
    })
}

function toJson(val) {
    var xtype = yua.type(val)
    if (xtype === 'array') {
        var array = []
        for (var i = 0; i < val.length; i++) {
            array[i] = toJson(val[i])
        }
        return array
    } else if (xtype === 'object') {
        var obj = {}
        for (i in val) {
            if (val.hasOwnProperty(i)) {
                var value = val[i]
                obj[i] = value && value.nodeType ? value : toJson(value)
            }
        }
        return obj
    }
    return val
}

var $modelDescriptor = {
    get: function() {
        return toJson(this)
    },
    set: noop,
    enumerable: false,
    configurable: true
}

/*********************************************************************
 *          监控数组（:repeat配合使用）                     *
 **********************************************************************/

var arrayMethods = ['push', 'pop', 'shift', 'unshift', 'splice']
var arrayProto = Array.prototype
var newProto = {
    notify: function() {
        $emit.call(this.$up, this.$pathname)
    },
    set: function(index, val) {
        if (index >>> 0 === index && this[index] !== val) {
            if (index > this.length) {
                throw Error(index + 'set方法的第一个参数不能大于原数组长度')
            }
            $emit.call(this.$up, this.$pathname + '.*', [val, this[index]])
            this.splice(index, 1, val)
        }
    },
    contains: function(el) {
        //判定是否包含
        return this.indexOf(el) !== -1
    },
    ensure: function(el) {
        if (!this.contains(el)) {
            //只有不存在才push
            this.push(el)
        }
        return this
    },
    pushArray: function(arr) {
        return this.push.apply(this, arr)
    },
    remove: function(el) {
        //移除第一个等于给定值的元素
        return this.removeAt(this.indexOf(el))
    },
    removeAt: function(index) {
        //移除指定索引上的元素
        if (index >>> 0 === index) {
            return this.splice(index, 1)
        }
        return []
    },
    size: function() {
        //取得数组长度，这个函数可以同步视图，length不能
        return this._.length
    },
    removeAll: function(all) {
        //移除N个元素
        if (Array.isArray(all)) {
            for (var i = this.length - 1; i >= 0; i--) {
                if (all.indexOf(this[i]) !== -1) {
                    _splice.call(this.$track, i, 1)
                    _splice.call(this, i, 1)
                }
            }
        } else if (typeof all === 'function') {
            for (i = this.length - 1; i >= 0; i--) {
                var el = this[i]
                if (all(el, i)) {
                    _splice.call(this.$track, i, 1)
                    _splice.call(this, i, 1)
                }
            }
        } else {
            _splice.call(this.$track, 0, this.length)
            _splice.call(this, 0, this.length)
        }
        if (!W3C) {
            this.$model = toJson(this)
        }
        this.notify()
        this._.length = this.length
    },
    clear: function() {
        this.removeAll()
        return this
    }
}

var _splice = arrayProto.splice
arrayMethods.forEach(function(method) {
    var original = arrayProto[method]
    newProto[method] = function() {
        // 继续尝试劫持数组元素的属性
        var args = []
        for (var i = 0, n = arguments.length; i < n; i++) {
            args[i] = observe(arguments[i], 0, 1, 1)
        }
        var result = original.apply(this, args)
        addTrack(this.$track, method, args)
        if (!W3C) {
            this.$model = toJson(this)
        }
        this.notify()
        this._.length = this.length
        return result
    }
})

'sort,reverse'.replace(rword, function(method) {
    newProto[method] = function() {
        var oldArray = this.concat() //保持原来状态的旧数组
        var newArray = this
        var mask = Math.random()
        var indexes = []
        var hasSort = false
        arrayProto[method].apply(newArray, arguments) //排序
        for (var i = 0, n = oldArray.length; i < n; i++) {
            var neo = newArray[i]
            var old = oldArray[i]
            if (neo === old) {
                indexes.push(i)
            } else {
                var index = oldArray.indexOf(neo)
                indexes.push(index) //得到新数组的每个元素在旧数组对应的位置
                oldArray[index] = mask //屏蔽已经找过的元素
                hasSort = true
            }
        }
        if (hasSort) {
            sortByIndex(this.$track, indexes)
            if (!W3C) {
                this.$model = toJson(this)
            }
            this.notify()
        }
        return this
    }
})

function sortByIndex(array, indexes) {
    var map = {}
    for (var i = 0, n = indexes.length; i < n; i++) {
        map[i] = array[i]
        var j = indexes[i]
        if (j in map) {
            array[i] = map[j]
            delete map[j]
        } else {
            array[i] = array[j]
        }
    }
}

function createTrack(n) {
    var ret = []
    for (var i = 0; i < n; i++) {
        ret[i] = generateID('$proxy$each')
    }
    return ret
}

function addTrack(track, method, args) {
    switch (method) {
        case 'push':
        case 'unshift':
            args = createTrack(args.length)
            break
        case 'splice':
            if (args.length > 2) {
                // 0, 5, a, b, c --> 0, 2, 0
                // 0, 5, a, b, c, d, e, f, g--> 0, 0, 3
                var del = args[1]
                var add = args.length - 2
                // args = [args[0], Math.max(del - add, 0)].concat(createTrack(Math.max(add - del, 0)))
                args = [args[0], args[1]].concat(createTrack(args.length - 2))
            }
            break
    }
    Array.prototype[method].apply(track, args)
}

/*********************************************************************
 *                           依赖调度系统                              *
 **********************************************************************/

//检测两个对象间的依赖关系
var dependencyDetection = (function() {
    var outerFrames = []
    var currentFrame
    return {
        begin: function(binding) {
            //accessorObject为一个拥有callback的对象
            outerFrames.push(currentFrame)
            currentFrame = binding
        },
        end: function() {
            currentFrame = outerFrames.pop()
        },
        collectDependency: function(array) {
            if (currentFrame) {
                //被dependencyDetection.begin调用
                currentFrame.callback(array)
            }
        }
    }
})()

//将绑定对象注入到其依赖项的订阅数组中
var roneval = /^on$/

function returnRandom() {
    return new Date() - 0
}

yua.injectBinding = function(binding) {
    binding.handler = binding.handler || directives[binding.type].update || noop
    binding.update = function() {
        var begin = false
        if (!binding.getter) {
            begin = true
            dependencyDetection.begin({
                callback: function(array) {
                    injectDependency(array, binding)
                }
            })
            binding.getter = parseExpr(binding.expr, binding.vmodels, binding)
            binding.observers.forEach(function(a) {
                a.v.$watch(a.p, binding)
            })
            delete binding.observers
        }
        try {
            var args = binding.fireArgs,
                a,
                b
            delete binding.fireArgs
            if (!args) {
                if (binding.type === 'on') {
                    a = binding.getter + ''
                } else {
                    try {
                        a = binding.getter.apply(0, binding.args)
                    } catch (e) {
                        a = null
                    }
                }
            } else {
                a = args[0]
                b = args[1]
            }
            b = typeof b === 'undefined' ? binding.oldValue : b
            if (binding._filters) {
                a = filters.$filter.apply(0, [a].concat(binding._filters))
            }
            if (binding.signature) {
                var xtype = yua.type(a)
                if (xtype !== 'array' && xtype !== 'object') {
                    throw Error('warning:' + binding.expr + '只能是对象或数组')
                }
                binding.xtype = xtype
                var vtrack = getProxyIds(binding.proxies || [], xtype)
                var mtrack =
                    a.$track ||
                    (xtype === 'array' ? createTrack(a.length) : Object.keys(a))
                binding.track = mtrack
                if (vtrack !== mtrack.join(';')) {
                    binding.handler(a, b)
                    binding.oldValue = 1
                }
            } else if (
                Array.isArray(a) ? a.length !== (b && b.length) : false
            ) {
                binding.handler(a, b)
                binding.oldValue = a.concat()
            } else if (!('oldValue' in binding) || a !== b) {
                binding.handler(a, b)
                binding.oldValue = Array.isArray(a) ? a.concat() : a
            }
        } catch (e) {
            delete binding.getter
            log('warning:exception throwed in [yua.injectBinding] ', e)
            var node = binding.element
            if (node && node.nodeType === 3) {
                node.nodeValue =
                    openTag +
                    (binding.oneTime ? '::' : '') +
                    binding.expr +
                    closeTag
            }
        } finally {
            begin && dependencyDetection.end()
        }
    }
    binding.update()
}

//将依赖项(比它高层的访问器或构建视图刷新函数的绑定对象)注入到订阅者数组
function injectDependency(list, binding) {
    if (binding.oneTime) return
    if (list && yua.Array.ensure(list, binding) && binding.element) {
        injectDisposeQueue(binding, list)
        if (new Date() - beginTime > 444) {
            rejectDisposeQueue()
        }
    }
}

function getProxyIds(a, isArray) {
    var ret = []
    for (var i = 0, el; (el = a[i++]); ) {
        ret.push(isArray ? el.$id : el.$key)
    }
    return ret.join(';')
}

/*********************************************************************
 *                     定时GC回收机制 (基于1.6基于频率的GC)                *
 **********************************************************************/

var disposeQueue = (yua.$$subscribers = [])
var beginTime = new Date()

//添加到回收列队中
function injectDisposeQueue(data, list) {
    data.list = list
    data.i = ~~data.i
    if (!data.uuid) {
        data.uuid = '_' + ++bindingID
    }
    if (!disposeQueue[data.uuid]) {
        disposeQueue[data.uuid] = '__'
        disposeQueue.push(data)
    }
}

var lastGCIndex = 0
function rejectDisposeQueue(data) {
    var i = lastGCIndex || disposeQueue.length
    var threshold = 0
    while ((data = disposeQueue[--i])) {
        if (data.i < 7) {
            if (data.element === null) {
                disposeQueue.splice(i, 1)
                if (data.list) {
                    yua.Array.remove(data.list, data)
                    delete disposeQueue[data.uuid]
                }
                continue
            }
            if (shouldDispose(data.element)) {
                //如果它的虚拟DOM不在VTree上或其属性不在VM上
                disposeQueue.splice(i, 1)
                yua.Array.remove(data.list, data)
                disposeData(data)
                //yua会在每次全量更新时,比较上次执行时间,
                //假若距离上次有半秒,就会发起一次GC,并且只检测当中的500个绑定
                //而一个正常的页面不会超过2000个绑定(500即取其4分之一)
                //用户频繁操作页面,那么2,3秒内就把所有绑定检测一遍,将无效的绑定移除
                if (threshold++ > 500) {
                    lastGCIndex = i
                    break
                }
                continue
            }
            data.i++
            //基于检测频率，如果检测过7次，可以认为其是长久存在的节点，那么以后每7次才检测一次
            if (data.i === 7) {
                data.i = 14
            }
        } else {
            data.i--
        }
    }
    beginTime = new Date()
}

function disposeData(data) {
    delete disposeQueue[data.uuid] // 先清除，不然无法回收了
    data.element = null
    data.rollback && data.rollback()
    for (var key in data) {
        data[key] = null
    }
}

function shouldDispose(el) {
    try {
        //IE下，如果文本节点脱离DOM树，访问parentNode会报错
        var fireError = el.parentNode.nodeType
    } catch (e) {
        return true
    }
    if (el.ifRemove) {
        // 如果节点被放到ifGroup，才移除
        if (!root.contains(el.ifRemove) && ifGroup === el.parentNode) {
            el.parentNode && el.parentNode.removeChild(el)
            return true
        }
    }
    return el.msRetain
        ? 0
        : el.nodeType === 1 ? !root.contains(el) : !yua.contains(root, el)
}

/************************************************************************
 *              HTML处理(parseHTML, innerHTML, clearHTML)                *
 *************************************************************************/

//parseHTML的辅助变量
var tagHooks = new function() {
    // jshint ignore:line
    yua.mix(this, {
        option: DOC.createElement('select'),
        thead: DOC.createElement('table'),
        td: DOC.createElement('tr'),
        area: DOC.createElement('map'),
        tr: DOC.createElement('tbody'),
        col: DOC.createElement('colgroup'),
        legend: DOC.createElement('fieldset'),
        _default: DOC.createElement('div'),
        g: DOC.createElementNS('http://www.w3.org/2000/svg', 'svg')
    })
    this.optgroup = this.option
    this.tbody = this.tfoot = this.colgroup = this.caption = this.thead
    this.th = this.td
}() // jshint ignore:line
String(
    'circle,defs,ellipse,image,line,path,polygon,polyline,rect,symbol,text,use'
).replace(rword, function(tag) {
    tagHooks[tag] = tagHooks.g //处理SVG
})

var rtagName = /<([\w:]+)/
var rxhtml = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/gi
var scriptTypes = oneObject([
    '',
    'text/javascript',
    'text/ecmascript',
    'application/ecmascript',
    'application/javascript'
])
var script = DOC.createElement('script')
var rhtml = /<|&#?\w+;/

yua.parseHTML = function(html) {
    var fragment = yuaFragment.cloneNode(false)
    if (typeof html !== 'string') {
        return fragment
    }
    if (!rhtml.test(html)) {
        fragment.appendChild(DOC.createTextNode(html))
        return fragment
    }
    html = html.replace(rxhtml, '<$1></$2>').trim()
    var tag = (rtagName.exec(html) || ['', ''])[1].toLowerCase(),
        //取得其标签名
        wrapper = tagHooks[tag] || tagHooks._default,
        firstChild
    wrapper.innerHTML = html
    var els = wrapper.getElementsByTagName('script')
    if (els.length) {
        //使用innerHTML生成的script节点不会发出请求与执行text属性
        for (var i = 0, el; (el = els[i++]); ) {
            if (scriptTypes[el.type]) {
                var neo = script.cloneNode(false) //FF不能省略参数
                ap.forEach.call(el.attributes, function(attr) {
                    neo.setAttribute(attr.name, attr.value)
                }) // jshint ignore:line
                neo.text = el.text
                el.parentNode.replaceChild(neo, el)
            }
        }
    }

    while ((firstChild = wrapper.firstChild)) {
        // 将wrapper上的节点转移到文档碎片上！
        fragment.appendChild(firstChild)
    }
    return fragment
}

yua.innerHTML = function(node, html) {
    var a = this.parseHTML(html)
    this.clearHTML(node).appendChild(a)
}

yua.clearHTML = function(node) {
    node.textContent = ''
    while (node.firstChild) {
        node.removeChild(node.firstChild)
    }
    return node
}

/*********************************************************************
 *                        yua的原型方法定义区                       *
 **********************************************************************/

function hyphen(target) {
    //转换为连字符线风格
    return target.replace(/([a-z\d])([A-Z]+)/g, '$1-$2').toLowerCase()
}

function camelize(target) {
    //转换为驼峰风格
    if (target.indexOf('-') < 0 && target.indexOf('_') < 0) {
        return target //提前判断，提高getStyle等的效率
    }
    return target.replace(/[-_][^-_]/g, function(match) {
        return match.charAt(1).toUpperCase()
    })
}

'add,remove'.replace(rword, function(method) {
    yua.fn[method + 'Class'] = function(cls) {
        var el = this[0]
        //https://developer.mozilla.org/zh-CN/docs/Mozilla/Firefox/Releases/26
        if (cls && typeof cls === 'string' && el && el.nodeType === 1) {
            cls.replace(/\S+/g, function(c) {
                el.classList[method](c)
            })
        }
        return this
    }
})

yua.fn.mix({
    hasClass: function(cls) {
        var el = this[0] || {} //IE10+, chrome8+, firefox3.6+, safari5.1+,opera11.5+支持classList,chrome24+,firefox26+支持classList2.0
        return el.nodeType === 1 && el.classList.contains(cls)
    },
    toggleClass: function(value, stateVal) {
        var className,
            i = 0
        var classNames = String(value).match(/\S+/g) || []
        var isBool = typeof stateVal === 'boolean'
        while ((className = classNames[i++])) {
            var state = isBool ? stateVal : !this.hasClass(className)
            this[state ? 'addClass' : 'removeClass'](className)
        }
        return this
    },
    attr: function(name, value) {
        if (arguments.length === 2) {
            this[0].setAttribute(name, value)
            return this
        } else {
            return this[0].getAttribute(name)
        }
    },
    data: function(name, value) {
        name = 'data-' + hyphen(name || '')
        switch (arguments.length) {
            case 2:
                this.attr(name, value)
                return this
            case 1:
                var val = this.attr(name)
                return parseData(val)
            case 0:
                var ret = {}
                ap.forEach.call(this[0].attributes, function(attr) {
                    if (attr) {
                        name = attr.name
                        if (!name.indexOf('data-')) {
                            name = camelize(name.slice(5))
                            ret[name] = parseData(attr.value)
                        }
                    }
                })
                return ret
        }
    },
    removeData: function(name) {
        name = 'data-' + hyphen(name)
        this[0].removeAttribute(name)
        return this
    },
    css: function(name, value) {
        if (yua.isPlainObject(name)) {
            for (var i in name) {
                yua.css(this, i, name[i])
            }
        } else {
            var ret = yua.css(this, name, value)
        }
        return ret !== void 0 ? ret : this
    },
    position: function() {
        var offsetParent,
            offset,
            elem = this[0],
            parentOffset = {
                top: 0,
                left: 0
            }
        if (!elem) {
            return
        }
        if (this.css('position') === 'fixed') {
            offset = elem.getBoundingClientRect()
        } else {
            offsetParent = this.offsetParent() //得到真正的offsetParent
            offset = this.offset() // 得到正确的offsetParent
            if (offsetParent[0].tagName !== 'HTML') {
                parentOffset = offsetParent.offset()
            }
            parentOffset.top += yua.css(offsetParent[0], 'borderTopWidth', true)
            parentOffset.left += yua.css(
                offsetParent[0],
                'borderLeftWidth',
                true
            )
            // Subtract offsetParent scroll positions
            parentOffset.top -= offsetParent.scrollTop()
            parentOffset.left -= offsetParent.scrollLeft()
        }
        return {
            top:
                offset.top -
                parentOffset.top -
                yua.css(elem, 'marginTop', true),
            left:
                offset.left -
                parentOffset.left -
                yua.css(elem, 'marginLeft', true)
        }
    },
    offsetParent: function() {
        var offsetParent = this[0].offsetParent
        while (offsetParent && yua.css(offsetParent, 'position') === 'static') {
            offsetParent = offsetParent.offsetParent
        }
        return yua(offsetParent || root)
    },
    bind: function(type, fn, phase) {
        if (this[0]) {
            //此方法不会链
            return yua.bind(this[0], type, fn, phase)
        }
    },
    unbind: function(type, fn, phase) {
        if (this[0]) {
            yua.unbind(this[0], type, fn, phase)
        }
        return this
    },
    val: function(value) {
        var node = this[0]
        if (node && node.nodeType === 1) {
            var get = arguments.length === 0
            var access = get ? ':get' : ':set'
            var fn = valHooks[getValType(node) + access]
            if (fn) {
                var val = fn(node, value)
            } else if (get) {
                return (node.value || '').replace(/\r/g, '')
            } else {
                node.value = value
            }
        }
        return get ? val : this
    }
})

if (root.dataset) {
    yua.fn.data = function(name, val) {
        name = name && camelize(name)
        var dataset = this[0].dataset
        switch (arguments.length) {
            case 2:
                dataset[name] = val
                return this
            case 1:
                val = dataset[name]
                return parseData(val)
            case 0:
                var ret = createMap()
                for (name in dataset) {
                    ret[name] = parseData(dataset[name])
                }
                return ret
        }
    }
}

yua.parseJSON = JSON.parse

var rbrace = /(?:\{[\s\S]*\}|\[[\s\S]*\])$/
function parseData(data) {
    try {
        if (typeof data === 'object') return data
        data =
            data === 'true'
                ? true
                : data === 'false'
                  ? false
                  : data === 'null'
                    ? null
                    : +data + '' === data
                      ? +data
                      : rbrace.test(data) ? JSON.parse(data) : data
    } catch (e) {}
    return data
}

yua.fireDom = function(elem, type, opts) {
    var hackEvent = DOC.createEvent('Events')
    hackEvent.initEvent(type, true, true)
    yua.mix(hackEvent, opts)
    elem.dispatchEvent(hackEvent)
}

yua.each(
    {
        scrollLeft: 'pageXOffset',
        scrollTop: 'pageYOffset'
    },
    function(method, prop) {
        yua.fn[method] = function(val) {
            var node = this[0] || {},
                win = getWindow(node),
                top = method === 'scrollTop'
            if (!arguments.length) {
                return win ? win[prop] : node[method]
            } else {
                if (win) {
                    win.scrollTo(!top ? val : win[prop], top ? val : win[prop])
                } else {
                    node[method] = val
                }
            }
        }
    }
)

function getWindow(node) {
    return node.window && node.document
        ? node
        : node.nodeType === 9 ? node.defaultView : false
}

//=============================css相关==================================

var cssHooks = (yua.cssHooks = createMap())
var prefixes = ['', '-webkit-', '-moz-', '-ms-'] //去掉opera-15的支持
var cssMap = {
    float: 'cssFloat'
}

yua.cssNumber = oneObject(
    'animationIterationCount,animationIterationCount,columnCount,order,flex,flexGrow,flexShrink,fillOpacity,fontWeight,lineHeight,opacity,orphans,widows,zIndex,zoom'
)

yua.cssName = function(name, host, camelCase) {
    if (cssMap[name]) {
        return cssMap[name]
    }
    host = host || root.style
    for (var i = 0, n = prefixes.length; i < n; i++) {
        camelCase = camelize(prefixes[i] + name)
        if (camelCase in host) {
            return (cssMap[name] = camelCase)
        }
    }
    return null
}

cssHooks['@:set'] = function(node, name, value) {
    node.style[name] = value
}

cssHooks['@:get'] = function(node, name) {
    if (!node || !node.style) {
        throw new Error('getComputedStyle要求传入一个节点 ' + node)
    }
    var ret,
        computed = getComputedStyle(node)
    if (computed) {
        ret =
            name === 'filter' ? computed.getPropertyValue(name) : computed[name]
        if (ret === '') {
            ret = node.style[name] //其他浏览器需要我们手动取内联样式
        }
    }
    return ret
}
cssHooks['opacity:get'] = function(node) {
    var ret = cssHooks['@:get'](node, 'opacity')
    return ret === '' ? '1' : ret
}

'top,left'.replace(rword, function(name) {
    cssHooks[name + ':get'] = function(node) {
        var computed = cssHooks['@:get'](node, name)
        return /px$/.test(computed)
            ? computed
            : yua(node).position()[name] + 'px'
    }
})

var cssShow = {
    position: 'absolute',
    visibility: 'hidden',
    display: 'block'
}
var rdisplayswap = /^(none|table(?!-c[ea]).+)/
function showHidden(node, array) {
    //http://www.cnblogs.com/rubylouvre/archive/2012/10/27/2742529.html
    if (node.offsetWidth <= 0) {
        //opera.offsetWidth可能小于0
        var styles = getComputedStyle(node, null)
        if (rdisplayswap.test(styles['display'])) {
            var obj = {
                node: node
            }
            for (var name in cssShow) {
                obj[name] = styles[name]
                node.style[name] = cssShow[name]
            }
            array.push(obj)
        }
        var parent = node.parentNode
        if (parent && parent.nodeType === 1) {
            showHidden(parent, array)
        }
    }
}

'Width,Height'.replace(rword, function(name) {
    //fix 481
    var method = name.toLowerCase(),
        clientProp = 'client' + name,
        scrollProp = 'scroll' + name,
        offsetProp = 'offset' + name
    cssHooks[method + ':get'] = function(node, which, override) {
        var boxSizing = -4
        if (typeof override === 'number') {
            boxSizing = override
        }
        which = name === 'Width' ? ['Left', 'Right'] : ['Top', 'Bottom']
        var ret = node[offsetProp] // border-box 0
        if (boxSizing === 2) {
            // margin-box 2
            return (
                ret +
                yua.css(node, 'margin' + which[0], true) +
                yua.css(node, 'margin' + which[1], true)
            )
        }
        if (boxSizing < 0) {
            // padding-box  -2
            ret =
                ret -
                yua.css(node, 'border' + which[0] + 'Width', true) -
                yua.css(node, 'border' + which[1] + 'Width', true)
        }
        if (boxSizing === -4) {
            // content-box -4
            ret =
                ret -
                yua.css(node, 'padding' + which[0], true) -
                yua.css(node, 'padding' + which[1], true)
        }
        return ret
    }
    cssHooks[method + '&get'] = function(node) {
        var hidden = []
        showHidden(node, hidden)
        var val = cssHooks[method + ':get'](node)
        for (var i = 0, obj; (obj = hidden[i++]); ) {
            node = obj.node
            for (var n in obj) {
                if (typeof obj[n] === 'string') {
                    node.style[n] = obj[n]
                }
            }
        }
        return val
    }
    yua.fn[method] = function(value) {
        //会忽视其display
        var node = this[0]
        if (arguments.length === 0) {
            if (node.setTimeout) {
                //取得窗口尺寸,IE9后可以用node.innerWidth /innerHeight代替
                return node['inner' + name]
            }
            if (node.nodeType === 9) {
                //取得页面尺寸
                var doc = node.documentElement
                //FF chrome    html.scrollHeight< body.scrollHeight
                //IE 标准模式 : html.scrollHeight> body.scrollHeight
                //IE 怪异模式 : html.scrollHeight 最大等于可视窗口多一点？
                return Math.max(
                    node.body[scrollProp],
                    doc[scrollProp],
                    node.body[offsetProp],
                    doc[offsetProp],
                    doc[clientProp]
                )
            }
            return cssHooks[method + '&get'](node)
        } else {
            return this.css(method, value)
        }
    }
    yua.fn['inner' + name] = function() {
        return cssHooks[method + ':get'](this[0], void 0, -2)
    }
    yua.fn['outer' + name] = function(includeMargin) {
        return cssHooks[method + ':get'](
            this[0],
            void 0,
            includeMargin === true ? 2 : 0
        )
    }
})

yua.fn.offset = function() {
    //取得距离页面左右角的坐标
    var node = this[0]
    try {
        var rect = node.getBoundingClientRect()
        // Make sure element is not hidden (display: none) or disconnected
        // https://github.com/jquery/jquery/pull/2043/files#r23981494
        if (rect.width || rect.height || node.getClientRects().length) {
            var doc = node.ownerDocument
            var root = doc.documentElement
            var win = doc.defaultView
            return {
                top: rect.top + win.pageYOffset - root.clientTop,
                left: rect.left + win.pageXOffset - root.clientLeft
            }
        }
    } catch (e) {
        return {
            left: 0,
            top: 0
        }
    }
}

//=============================val相关=======================

function getValType(elem) {
    var ret = elem.tagName.toLowerCase()
    return ret === 'input' && /checkbox|radio/.test(elem.type) ? 'checked' : ret
}

var valHooks = {
    'select:get': function(node, value) {
        var option,
            options = node.options,
            index = node.selectedIndex,
            one = node.type === 'select-one' || index < 0,
            values = one ? null : [],
            max = one ? index + 1 : options.length,
            i = index < 0 ? max : one ? index : 0
        for (; i < max; i++) {
            option = options[i]
            //旧式IE在reset后不会改变selected，需要改用i === index判定
            //我们过滤所有disabled的option元素，但在safari5下，如果设置select为disable，那么其所有孩子都disable
            //因此当一个元素为disable，需要检测其是否显式设置了disable及其父节点的disable情况
            if ((option.selected || i === index) && !option.disabled) {
                value = option.value
                if (one) {
                    return value
                }
                //收集所有selected值组成数组返回
                values.push(value)
            }
        }
        return values
    },
    'select:set': function(node, values, optionSet) {
        values = [].concat(values) //强制转换为数组
        for (var i = 0, el; (el = node.options[i++]); ) {
            if ((el.selected = values.indexOf(el.value) > -1)) {
                optionSet = true
            }
        }
        if (!optionSet) {
            node.selectedIndex = -1
        }
    }
}

var keyMap = {}
var keys = [
    'break,case,catch,continue,debugger,default,delete,do,else,false',
    'finally,for,function,if,in,instanceof,new,null,return,switch,this',
    'throw,true,try,typeof,var,void,while,with' /* 关键字*/,
    'abstract,boolean,byte,char,class,const,double,enum,export,extends',
    'final,float,goto,implements,import,int,interface,long,native',
    'package,private,protected,public,short,static,super,synchronized',
    'throws,transient,volatile' /*保留字*/,
    'arguments,let,yield,undefined'
].join(',')
keys.replace(/\w+/g, function(a) {
    keyMap[a] = true
})

var ridentStart = /[a-z_$]/i
var rwhiteSpace = /[\s\uFEFF\xA0]/
function getIdent(input, lastIndex) {
    var result = []
    var subroutine = !!lastIndex
    lastIndex = lastIndex || 0
    //将表达式中的标识符抽取出来
    var state = 'unknown'
    var variable = ''
    for (var i = 0; i < input.length; i++) {
        var c = input.charAt(i)
        if (c === "'" || c === '"') {
            //字符串开始
            if (state === 'unknown') {
                state = c
            } else if (state === c) {
                //字符串结束
                state = 'unknown'
            }
        } else if (c === '\\') {
            if (state === "'" || state === '"') {
                i++
            }
        } else if (ridentStart.test(c)) {
            //碰到标识符
            if (state === 'unknown') {
                state = 'variable'
                variable = c
            } else if (state === 'maybePath') {
                variable = result.pop()
                variable += '.' + c
                state = 'variable'
            } else if (state === 'variable') {
                variable += c
            }
        } else if (/\w/.test(c)) {
            if (state === 'variable') {
                variable += c
            }
        } else if (c === '.') {
            if (state === 'variable') {
                if (variable) {
                    result.push(variable)
                    variable = ''
                    state = 'maybePath'
                }
            }
        } else if (c === '[') {
            if (state === 'variable' || state === 'maybePath') {
                if (variable) {
                    //如果前面存在变量,收集它
                    result.push(variable)
                    variable = ''
                }
                var lastLength = result.length
                var last = result[lastLength - 1]
                var innerResult = getIdent(input.slice(i), i)
                if (innerResult.length) {
                    //如果括号中存在变量,那么这里添加通配符
                    result[lastLength - 1] = last + '.*'
                    result = innerResult.concat(result)
                } else {
                    //如果括号中的东西是确定的,直接转换为其子属性
                    var content = input.slice(i + 1, innerResult.i)
                    try {
                        var text = scpCompile(['return ' + content])()
                        result[lastLength - 1] = last + '.' + text
                    } catch (e) {}
                }
                state = 'maybePath' //]后面可能还接东西
                i = innerResult.i
            }
        } else if (c === ']') {
            if (subroutine) {
                result.i = i + lastIndex
                addVar(result, variable)
                return result
            }
        } else if (rwhiteSpace.test(c) && c !== '\r' && c !== '\n') {
            if (state === 'variable') {
                if (addVar(result, variable)) {
                    state = 'maybePath' // aaa . bbb 这样的情况
                }
                variable = ''
            }
        } else {
            addVar(result, variable)
            state = 'unknown'
            variable = ''
        }
    }
    addVar(result, variable)
    return result
}

function addVar(array, element) {
    if (element && !keyMap[element]) {
        array.push(element)
        return true
    }
}

function addAssign(vars, vmodel, name, binding) {
    var ret = [],
        prefix = ' = ' + name + '.'
    for (var i = vars.length, prop; (prop = vars[--i]); ) {
        var arr = prop.split('.'),
            a
        var first = arr[0]
        while ((a = arr.shift())) {
            if (vmodel.hasOwnProperty(a)) {
                ret.push(first + prefix + first)
                binding.observers.push({
                    v: vmodel,
                    p: prop
                })
                vars.splice(i, 1)
            } else {
                break
            }
        }
    }
    return ret
}

var rproxy = /(\$proxy\$[a-z]+)\-[\-0-9a-f]+$/
var variablePool = new Cache(218)
//缓存求值函数，以便多次利用
var evaluatorPool = new Cache(128)

function getVars(expr) {
    expr = expr.trim()
    var ret = variablePool.get(expr)
    if (ret) {
        return ret.concat()
    }
    var array = getIdent(expr)
    var uniq = {}
    var result = []
    for (var i = 0, el; (el = array[i++]); ) {
        if (!uniq[el]) {
            uniq[el] = 1
            result.push(el)
        }
    }
    return variablePool.put(expr, result).concat()
}

function parseExpr(expr, vmodels, binding) {
    var filters = binding.filters
    if (typeof filters === 'string' && filters.trim() && !binding._filters) {
        binding._filters = parseFilter(filters.trim())
    }

    var vars = getVars(expr)
    var expose = new Date() - 0
    var assigns = []
    var names = []
    var args = []
    binding.observers = []
    for (var i = 0, sn = vmodels.length; i < sn; i++) {
        if (vars.length) {
            var name = 'vm' + expose + '_' + i
            names.push(name)
            args.push(vmodels[i])
            assigns.push.apply(
                assigns,
                addAssign(vars, vmodels[i], name, binding)
            )
        }
    }
    binding.args = args
    var dataType = binding.type
    var exprId =
        vmodels.map(function(el) {
            return String(el.$id).replace(rproxy, '$1')
        }) +
        expr +
        dataType
    var getter = evaluatorPool.get(exprId) //直接从缓存，免得重复生成
    if (getter) {
        if (dataType === 'duplex') {
            var setter = evaluatorPool.get(exprId + 'setter')
            binding.setter = setter.apply(setter, binding.args)
        }
        return (binding.getter = getter)
    }

    if (!assigns.length) {
        assigns.push('fix' + expose)
    }

    if (dataType === 'duplex') {
        var nameOne = {}
        assigns.forEach(function(a) {
            var arr = a.split('=')
            nameOne[arr[0].trim()] = arr[1].trim()
        })
        expr = expr.replace(/[\$\w]+/, function(a) {
            return nameOne[a] ? nameOne[a] : a
        })
        /* jshint ignore:start */
        var fn2 = scpCompile(
            names.concat(
                "'use strict';" + 'return function(vvv){' + expr + ' = vvv\n}\n'
            )
        )
        /* jshint ignore:end */
        evaluatorPool.put(exprId + 'setter', fn2)
        binding.setter = fn2.apply(fn2, binding.args)
    }

    if (dataType === 'on') {
        //事件绑定
        if (expr.indexOf('(') === -1) {
            expr += '.call(this, $event)'
        } else {
            expr = expr.replace('(', '.call(this,')
        }
        names.push('$event')
        expr = '\nreturn ' + expr + ';' //IE全家 Function("return ")出错，需要Function("return ;")
        var lastIndex = expr.lastIndexOf('\nreturn')
        var header = expr.slice(0, lastIndex)
        var footer = expr.slice(lastIndex)
        expr = header + '\n' + footer
    } else {
        expr = '\nreturn ' + expr + ';' //IE全家 Function("return ")出错，需要Function("return ;")
    }
    /* jshint ignore:start */
    getter = scpCompile(
        names.concat("'use strict';\nvar " + assigns.join(',\n') + expr)
    )
    /* jshint ignore:end */

    return evaluatorPool.put(exprId, getter)
}

function normalizeExpr(code) {
    var hasExpr = rexpr.test(code) //比如:class="width{{w}}"的情况
    if (hasExpr) {
        var array = scanExpr(code)
        if (array.length === 1) {
            return array[0].expr
        }
        return array
            .map(function(el) {
                return el.type ? '(' + el.expr + ')' : quote(el.expr)
            })
            .join(' + ')
    } else {
        return code
    }
}

yua.normalizeExpr = normalizeExpr
yua.parseExprProxy = parseExpr

var rthimRightParentheses = /\)\s*$/
var rthimOtherParentheses = /\)\s*\|/g
var rquoteFilterName = /\|\s*([$\w]+)/g
var rpatchBracket = /"\s*\["/g
var rthimLeftParentheses = /"\s*\(/g
function parseFilter(filters) {
    filters =
        filters
            .replace(rthimRightParentheses, '') //处理最后的小括号
            .replace(rthimOtherParentheses, function() {
                //处理其他小括号
                return '],|'
            })
            .replace(rquoteFilterName, function(a, b) {
                //处理|及它后面的过滤器的名字
                return '[' + quote(b)
            })
            .replace(rpatchBracket, function() {
                return '"],["'
            })
            .replace(rthimLeftParentheses, function() {
                return '",'
            }) + ']'
    /* jshint ignore:start */
    return scpCompile(['return [' + filters + ']'])()
    /* jshint ignore:end */
}

/*********************************************************************
 *                          编译系统                                  *
 **********************************************************************/

var quote = JSON.stringify

/*********************************************************************
 *                           扫描系统                                 *
 **********************************************************************/

yua.scan = function(elem, vmodel) {
    elem = elem || root
    var vmodels = vmodel ? [].concat(vmodel) : []
    scanTag(elem, vmodels)
}

//http://www.w3.org/TR/html5/syntax.html#void-elements
var stopScan = oneObject(
    'area,base,basefont,br,col,command,embed,hr,img,input,link,meta,param,source,track,wbr,noscript,script,style,textarea'.toUpperCase()
)

function checkScan(elem, callback, innerHTML) {
    var id = setTimeout(function() {
        var currHTML = elem.innerHTML
        clearTimeout(id)
        if (currHTML === innerHTML) {
            callback()
        } else {
            checkScan(elem, callback, currHTML)
        }
    })
}

function createSignalTower(elem, vmodel) {
    var id = elem.getAttribute('yuactrl') || vmodel.$id
    elem.setAttribute('yuactrl', id)
    if (vmodel.$events) {
        vmodel.$events.expr = elem.tagName + '[yuactrl="' + id + '"]'
    }
}

function getBindingCallback(elem, name, vmodels) {
    var callback = elem.getAttribute(name)
    if (callback) {
        for (var i = 0, vm; (vm = vmodels[i++]); ) {
            if (
                vm.hasOwnProperty(callback) &&
                typeof vm[callback] === 'function'
            ) {
                return vm[callback]
            }
        }
    }
}

function executeBindings(bindings, vmodels) {
    for (var i = 0, binding; (binding = bindings[i++]); ) {
        binding.vmodels = vmodels
        directives[binding.type].init(binding)

        yua.injectBinding(binding)
        if (binding.getter && binding.element.nodeType === 1) {
            //移除数据绑定，防止被二次解析
            //chrome使用removeAttributeNode移除不存在的特性节点时会报错 https://github.com/RubyLouvre/yua/issues/99
            binding.element.removeAttribute(binding.name)
        }
    }
    bindings.length = 0
}

//https://github.com/RubyLouvre/yua/issues/636
var mergeTextNodes =
    IEVersion && window.MutationObserver
        ? function(elem) {
              var node = elem.firstChild,
                  text
              while (node) {
                  var aaa = node.nextSibling
                  if (node.nodeType === 3) {
                      if (text) {
                          text.nodeValue += node.nodeValue
                          elem.removeChild(node)
                      } else {
                          text = node
                      }
                  } else {
                      text = null
                  }
                  node = aaa
              }
          }
        : 0
var roneTime = /^\s*::/
var rmsAttr = /:(\w+)-?(.*)/

var events = oneObject(
    'animationend,blur,change,input,click,dblclick,focus,keydown,keypress,keyup,mousedown,mouseenter,mouseleave,mousemove,mouseout,mouseover,mouseup,scan,scroll,submit'
)
var obsoleteAttrs = oneObject(
    'value,title,alt,checked,selected,disabled,readonly,enabled,href,src'
)
function bindingSorter(a, b) {
    return a.priority - b.priority
}

var rnoCollect = /^(:\S+|data-\S+|on[a-z]+|id|style|class)$/
var ronattr = /^on\-[\w-]+$/
function getOptionsFromTag(elem, vmodels) {
    var attributes = elem.attributes
    var ret = {}
    for (var i = 0, attr; (attr = attributes[i++]); ) {
        var name = attr.name
        if (attr.specified && !rnoCollect.test(name)) {
            var camelizeName = camelize(attr.name)
            if (/^on\-[\w-]+$/.test(name)) {
                ret[camelizeName] = getBindingCallback(elem, name, vmodels)
            } else {
                ret[camelizeName] = parseData(attr.value)
            }
        }
    }
    return ret
}

function scanAttr(elem, vmodels, match) {
    var scanNode = true
    if (vmodels.length) {
        var attributes = elem.attributes
        var bindings = []
        var uniq = {}
        for (var i = 0, attr; (attr = attributes[i++]); ) {
            var name = attr.name
            if (uniq[name]) {
                //IE8下:repeat,:with BUG
                continue
            }
            uniq[name] = 1
            if (attr.specified) {
                if ((match = name.match(rmsAttr))) {
                    //如果是以指定前缀命名的
                    var type = match[1]
                    var param = match[2] || ''
                    var value = attr.value
                    if (events[type]) {
                        param = type
                        type = 'on'
                    } else if (obsoleteAttrs[type]) {
                        param = type
                        type = 'attr'
                        name = ':' + type + '-' + param
                        log('warning!请改用' + name + '代替' + attr.name + '!')
                    }
                    if (directives[type]) {
                        var newValue = value.replace(roneTime, '')
                        var oneTime = value !== newValue
                        var binding = {
                            type: type,
                            param: param,
                            element: elem,
                            name: name,
                            expr: newValue,
                            oneTime: oneTime,
                            uuid: '_' + ++bindingID,
                            priority:
                                (directives[type].priority ||
                                    type.charCodeAt(0) * 10) +
                                (Number(param.replace(/\D/g, '')) || 0)
                        }
                        if (
                            type === 'html' ||
                            type === 'text' ||
                            type === 'attr'
                        ) {
                            var filters = getToken(value).filters
                            binding.expr = binding.expr.replace(filters, '')
                            binding.filters = filters
                                .replace(rhasHtml, function() {
                                    binding.type = 'html'
                                    binding.group = 1
                                    return ''
                                })
                                .trim() // jshint ignore:line
                        } else if (type === 'duplex') {
                            var hasDuplex = name
                        } else if (name === ':if-loop') {
                            binding.priority += 100
                        } else if (name === ':attr-value') {
                            var hasAttrValue = name
                        }
                        bindings.push(binding)
                    }
                }
            }
        }
        if (bindings.length) {
            bindings.sort(bindingSorter)

            if (hasDuplex && hasAttrValue && elem.type === 'text') {
                log('warning!一个控件不能同时定义:attr-value与' + hasDuplex)
            }

            for (i = 0; (binding = bindings[i]); i++) {
                type = binding.type
                if (rnoscanAttrBinding.test(type)) {
                    return executeBindings(bindings.slice(0, i + 1), vmodels)
                } else if (scanNode) {
                    scanNode = !rnoscanNodeBinding.test(type)
                }
            }
            executeBindings(bindings, vmodels)
        }
    }
    if (
        scanNode &&
        !stopScan[elem.tagName] &&
        (isWidget(elem) ? elem.msResolved : 1)
    ) {
        mergeTextNodes && mergeTextNodes(elem)
        scanNodeList(elem, vmodels) //扫描子孙元素
    }
}

var rnoscanAttrBinding = /^if|widget|repeat$/
var rnoscanNodeBinding = /^html|include$/

function scanNodeList(elem, vmodels) {
    var nodes = yua.slice(elem.childNodes)
    scanNodeArray(nodes, vmodels)
}

function scanNodeArray(nodes, vmodels) {
    function _delay_component(name) {
        setTimeout(function() {
            yua.component(name)
        })
    }
    for (var i = 0, node; (node = nodes[i++]); ) {
        switch (node.nodeType) {
            case 1:
                var elem = node
                if (
                    !elem.msResolved &&
                    elem.parentNode &&
                    elem.parentNode.nodeType === 1
                ) {
                    var widget = isWidget(elem)

                    if (widget) {
                        componentQueue.push({
                            element: elem,
                            vmodels: vmodels,
                            name: widget
                        })
                        if (yua.components[widget]) {
                            // log(widget, yua.components)
                            //确保所有:attr-name扫描完再处理
                            _delay_component(widget)
                        }
                    }
                }

                scanTag(node, vmodels) //扫描元素节点

                if (node.msHasEvent) {
                    yua.fireDom(node, 'datasetchanged', {
                        bubble: node.msHasEvent
                    })
                }

                break
            case 3:
                if (rexpr.test(node.nodeValue)) {
                    scanText(node, vmodels, i) //扫描文本节点
                }
                break
        }
    }
}

function scanTag(elem, vmodels, node) {
    //扫描顺序  :skip(0) --> :important(1) --> :controller(2) --> :if(10) --> :repeat(100)
    //--> :if-loop(110) --> :attr(970) ...--> :each(1400)-->:with(1500)--〉:duplex(2000)垫后
    var a = elem.getAttribute(':skip')
    var b = elem.getAttributeNode(':important')
    var c = elem.getAttributeNode(':controller')
    if (typeof a === 'string') {
        return
    } else if ((node = b || c)) {
        var newVmodel = yua.vmodels[node.value]

        if (!newVmodel) {
            return
        }

        //把父级VM补上
        newVmodel.$up = vmodels[0]
        //:important不包含父VM，:controller相反
        vmodels = node === b ? [newVmodel] : [newVmodel].concat(vmodels)

        elem.removeAttribute(node.name) //removeAttributeNode不会刷新[:controller]样式规则
        elem.classList.remove(node.name)
        createSignalTower(elem, newVmodel)
    }
    scanAttr(elem, vmodels) //扫描特性节点

    if (newVmodel) {
        setTimeout(function() {
            newVmodel.$fire(':scan-end', elem)
        })
    }
}
var rhasHtml = /\|\s*html(?:\b|$)/,
    r11a = /\|\|/g,
    rlt = /&lt;/g,
    rgt = /&gt;/g,
    rstringLiteral = /(['"])(\\\1|.)+?\1/g,
    rline = /\r?\n/g
function getToken(value) {
    if (value.indexOf('|') > 0) {
        var scapegoat = value.replace(rstringLiteral, function(_) {
            return Array(_.length + 1).join('1') // jshint ignore:line
        })
        var index = scapegoat.replace(r11a, '\u1122\u3344').indexOf('|') //干掉所有短路或
        if (index > -1) {
            return {
                type: 'text',
                filters: value.slice(index).trim(),
                expr: value.slice(0, index)
            }
        }
    }
    return {
        type: 'text',
        expr: value,
        filters: ''
    }
}

function scanExpr(str) {
    var tokens = [],
        value,
        start = 0,
        stop
    do {
        stop = str.indexOf(openTag, start)
        if (stop === -1) {
            break
        }
        value = str.slice(start, stop)
        if (value) {
            // {{ 左边的文本
            tokens.push({
                expr: value
            })
        }
        start = stop + openTag.length
        stop = str.indexOf(closeTag, start)
        if (stop === -1) {
            break
        }
        value = str.slice(start, stop)
        if (value) {
            //处理{{ }}插值表达式
            tokens.push(getToken(value.replace(rline, '')))
        }
        start = stop + closeTag.length
    } while (1)
    value = str.slice(start)
    if (value) {
        //}} 右边的文本
        tokens.push({
            expr: value
        })
    }
    return tokens
}

function scanText(textNode, vmodels, index) {
    var bindings = [],
        tokens = scanExpr(textNode.data)
    if (tokens.length) {
        for (var i = 0, token; (token = tokens[i++]); ) {
            var node = DOC.createTextNode(token.expr) //将文本转换为文本节点，并替换原来的文本节点
            if (token.type) {
                token.expr = token.expr.replace(roneTime, function() {
                    token.oneTime = true
                    return ''
                }) // jshint ignore:line
                token.element = node
                token.filters = token.filters.replace(rhasHtml, function() {
                    token.type = 'html'
                    return ''
                }) // jshint ignore:line
                token.pos = index * 1000 + i
                bindings.push(token) //收集带有插值表达式的文本
            }
            yuaFragment.appendChild(node)
        }
        textNode.parentNode.replaceChild(yuaFragment, textNode)
        if (bindings.length) executeBindings(bindings, vmodels)
    }
}

//使用来自游戏界的双缓冲技术,减少对视图的冗余刷新
var Buffer = function() {
    this.queue = []
}
Buffer.prototype = {
    render: function(isAnimate) {
        if (!this.locked) {
            this.locked = isAnimate ? root.offsetHeight + 10 : 1
            var me = this
            yua.nextTick(function() {
                me.flush()
            })
        }
    },
    flush: function() {
        for (var i = 0, sub; (sub = this.queue[i++]); ) {
            sub.update && sub.update()
        }
        this.locked = 0
        this.queue = []
    }
}

var buffer = new Buffer()

var componentQueue = []
var widgetList = []
var componentHooks = {
    $construct: function() {
        return yua.mix.apply(null, arguments)
    },
    $ready: noop,
    $init: noop,
    $dispose: noop,
    $container: null,
    $childReady: noop,
    $$template: function(str) {
        return str
    }
}

yua.components = {}
yua.component = function(name, opts) {
    if (opts) {
        yua.components[name] = yua.mix({}, componentHooks, opts)
    }
    for (var i = 0, obj; (obj = componentQueue[i]); i++) {
        if (name === obj.name) {
            componentQueue.splice(i, 1)
            i--

            ;(function(host, hooks, elem, widget) {
                //如果elem已从Document里移除,直接返回
                if (!yua.contains(DOC, elem) || elem.msResolved) {
                    yua.Array.remove(componentQueue, host)
                    return
                }

                var dependencies = 1
                var global = componentHooks

                //===========收集各种配置=======
                if (elem.getAttribute(':attr-identifier')) {
                    //如果还没有解析完,就延迟一下 #1155
                    return
                }
                var elemOpts = getOptionsFromTag(elem, host.vmodels)
                var vmOpts = getOptionsFromVM(
                    host.vmodels,
                    elemOpts.config || host.name
                )
                var $id =
                    elemOpts.$id || elemOpts.identifier || generateID(widget)
                delete elemOpts.config
                delete elemOpts.$id
                delete elemOpts.identifier
                var componentDefinition = {
                    $up: host.vmodels[0],
                    $ups: host.vmodels
                }

                yua.mix(true, componentDefinition, hooks)

                componentDefinition = yua.components[name].$construct.call(
                    elem,
                    componentDefinition,
                    vmOpts,
                    elemOpts
                )

                componentDefinition.$refs = {}
                componentDefinition.$id = $id

                //==========构建VM=========
                var keepContainer = componentDefinition.$container
                var keepTemplate = componentDefinition.$template
                delete componentDefinition.$up
                delete componentDefinition.$ups
                delete componentDefinition.$slot
                delete componentDefinition.$replace
                delete componentDefinition.$container
                delete componentDefinition.$construct

                var vmodel = yua(componentDefinition) || {}
                vmodel.$ups = host.vmodels
                vmodel.$up = host.vmodels[0]
                elem.msResolved = 1 //防止二进扫描此元素
                vmodel.$init(vmodel, elem)
                global.$init(vmodel, elem)
                var nodes = elem.childNodes

                if (vmodel.$$template) {
                    yua.clearHTML(elem)
                    elem.innerHTML = vmodel.$$template(keepTemplate)
                }

                // 组件所使用的标签是temlate,所以必须要要用子元素替换掉
                var child = elem.content.firstChild
                if (!child || serialize.call(child) === '[object Text]') {
                    var tmpDom = document.createElement('div')
                    if (child) {
                        tmpDom.appendChild(child)
                    }
                    child = tmpDom
                    tmpDom = null
                }
                elem.parentNode.replaceChild(child, elem)
                child.msResolved = 1
                var cssText = elem.style.cssText
                var className = elem.className
                elem = host.element = child
                elem.style.cssText += ';' + cssText
                if (className) {
                    yua(elem).addClass(className)
                }
                //指定了组件的容器的话,则把组件节点转过去
                if (keepContainer) {
                    keepContainer.appendChild(elem)
                }
                yua.fireDom(elem, 'datasetchanged', {
                    vm: vmodel,
                    childReady: 1
                })
                var children = 0
                var removeFn = yua.bind(elem, 'datasetchanged', function(e) {
                    if (e.childReady) {
                        dependencies += e.childReady
                        if (vmodel !== e.vm) {
                            vmodel.$refs[e.vm.$id] = e.vm
                            if (e.childReady === -1) {
                                children++
                                vmodel.$childReady(vmodel, elem, e)
                            }
                            e.stopPropagation()
                        }
                    }
                    if (dependencies === 0) {
                        var id1 = setTimeout(function() {
                            clearTimeout(id1)

                            vmodel.$ready(vmodel, elem, host.vmodels)
                            global.$ready(vmodel, elem, host.vmodels)
                        }, children ? Math.max(children * 17, 100) : 17)
                        yua.unbind(elem, 'datasetchanged', removeFn)
                        //==================
                        host.rollback = function() {
                            try {
                                vmodel.$dispose(vmodel, elem)
                                global.$dispose(vmodel, elem)
                            } catch (e) {}
                            delete yua.vmodels[vmodel.$id]
                        }
                        injectDisposeQueue(host, widgetList)
                        if (window.chrome) {
                            elem.addEventListener(
                                'DOMNodeRemovedFromDocument',
                                function() {
                                    setTimeout(rejectDisposeQueue)
                                }
                            )
                        }
                    }
                })
                scanTag(elem, [vmodel].concat(host.vmodels))
                yua.vmodels[vmodel.$id] = vmodel
                if (!elem.childNodes.length) {
                    yua.fireDom(elem, 'datasetchanged', {
                        vm: vmodel,
                        childReady: -1
                    })
                } else {
                    var id2 = setTimeout(function() {
                        clearTimeout(id2)
                        yua.fireDom(elem, 'datasetchanged', {
                            vm: vmodel,
                            childReady: -1
                        })
                    }, 17)
                }
            })(obj, yua.components[name], obj.element, obj.name) // jshint ignore:line
        }
    }
}

function getOptionsFromVM(vmodels, pre) {
    if (pre) {
        for (var i = 0, v; (v = vmodels[i++]); ) {
            if (v.hasOwnProperty(pre) && typeof v[pre] === 'object') {
                var vmOptions = v[pre]
                return vmOptions.$model || vmOptions
                break
            }
        }
    }
    return {}
}

function isWidget(el) {
    //如果是组件,则返回组件的名字
    var name = el.nodeName.toLowerCase()
    if (name === 'template' && el.getAttribute('name')) {
        return el.getAttribute('name')
    }
    return null
}

var bools = [
    'autofocus,autoplay,async,allowTransparency,checked,controls',
    'declare,disabled,defer,defaultChecked,defaultSelected',
    'contentEditable,isMap,loop,multiple,noHref,noResize,noShade',
    'open,readOnly,selected'
].join(',')
var boolMap = {}
bools.replace(rword, function(name) {
    boolMap[name.toLowerCase()] = name
})

var propMap = {
    //属性名映射
    'accept-charset': 'acceptCharset',
    char: 'ch',
    charoff: 'chOff',
    class: 'className',
    for: 'htmlFor',
    'http-equiv': 'httpEquiv'
}

var anomaly = [
    'accessKey,bgColor,cellPadding,cellSpacing,codeBase,codeType,colSpan',
    'dateTime,defaultValue,frameBorder,longDesc,maxLength,marginWidth,marginHeight',
    'rowSpan,tabIndex,useMap,vSpace,valueType,vAlign'
].join(',')
anomaly.replace(rword, function(name) {
    propMap[name.toLowerCase()] = name
})

var attrDir = yua.directive('attr', {
    init: function(binding) {
        //{{aaa}} --> aaa
        //{{aaa}}/bbb.html --> (aaa) + "/bbb.html"
        binding.expr = normalizeExpr(binding.expr.trim())
        if (binding.type === 'include') {
            var elem = binding.element
            effectBinding(elem, binding)
            binding.includeRendered = getBindingCallback(
                elem,
                'data-include-rendered',
                binding.vmodels
            )
            binding.includeLoaded = getBindingCallback(
                elem,
                'data-include-loaded',
                binding.vmodels
            )
            var outer = (binding.includeReplace = !!yua(elem).data(
                'includeReplace'
            ))
            if (yua(elem).data('includeCache')) {
                binding.templateCache = {}
            }
            binding.start = DOC.createComment(':include')
            binding.end = DOC.createComment(':include-end')
            if (outer) {
                binding.element = binding.end
                binding._element = elem
                elem.parentNode.insertBefore(binding.start, elem)
                elem.parentNode.insertBefore(binding.end, elem.nextSibling)
            } else {
                elem.insertBefore(binding.start, elem.firstChild)
                elem.appendChild(binding.end)
            }
        }
    },
    update: function(val) {
        var elem = this.element
        var obj = val

        if (typeof obj === 'object' && obj !== null) {
            if (!yua.isPlainObject(obj)) obj = obj.$model
        } else {
            if (!this.param) return

            obj = {}
            obj[this.param] = val
        }

        for (var i in obj) {
            if (i === 'style') {
                console.error('设置style样式, 请改用 :css指令')
                continue
            }
            if (i === 'href' || i === 'src') {
                //处理IE67自动转义的问题
                if (!root.hasAttribute) obj[i] = obj[i].replace(/&amp;/g, '&')

                elem[i] = obj[i]

                //chrome v37- 下embed标签动态设置的src，无法发起请求
                if (window.chrome && elem.tagName === 'EMBED') {
                    var parent = elem.parentNode
                    var com = document.createComment(':src')
                    parent.replaceChild(com, elem)
                    parent.replaceChild(elem, com)
                }
            } else {
                var k = i
                //古董IE下，部分属性名字要进行映射
                if (!W3C && propMap[k]) k = propMap[k]

                if (typeof elem[boolMap[k]] === 'boolean') {
                    //布尔属性必须使用el.xxx = true|false方式设值
                    elem[boolMap[k]] = !!obj[i]

                    //如果为false, IE全系列下相当于setAttribute(xxx, ''),会影响到样式,需要进一步处理
                    if (!obj[i]) obj[i] = !!obj[i]
                }
                if (obj[i] === false || obj[i] === null || obj[i] === undefined)
                    return elem.removeAttribute(k)

                //SVG只能使用setAttribute(xxx, yyy), VML只能使用elem.xxx = yyy ,HTML的固有属性必须elem.xxx = yyy
                var isInnate = rsvg.test(elem)
                    ? false
                    : DOC.namespaces && isVML(elem)
                      ? true
                      : k in elem.cloneNode(false)
                if (isInnate) {
                    elem[k] = obj[i]
                } else {
                    elem.setAttribute(k, obj[i])
                }
            }
        }
    }
})

//这几个指令都可以使用插值表达式，如:src="aaa/{{b}}/{{c}}.html"
'title,alt,src,value,css,include,href,data'.replace(rword, function(name) {
    directives[name] = attrDir
})

//类名定义， :class="xx:yy"  :class="{xx: yy}" :class="xx" :class="{{xx}}"
yua.directive('class', {
    init: function(binding) {
        var expr = []
        if (!/^\{.*\}$/.test(binding.expr)) {
            expr = binding.expr.split(':')
            expr[1] = (expr[1] && expr[1].trim()) || 'true'
            var arr = expr[0].split(/\s+/)
            binding.expr =
                '{' +
                arr
                    .map(function(it) {
                        return it + ': ' + expr[1]
                    })
                    .join(', ') +
                '}'
        } else if (/^\{\{.*\}\}$/.test(binding.expr)) {
            binding.expr = binding.expr.slice(2, -2)
        }

        if (binding.type === 'hover' || binding.type === 'active') {
            //确保只绑定一次
            if (!binding.hasBindEvent) {
                var elem = binding.element
                var $elem = yua(elem)
                var activate = 'mouseenter' //在移出移入时切换类名
                var abandon = 'mouseleave'
                if (binding.type === 'active') {
                    //在聚焦失焦中切换类名
                    elem.tabIndex = elem.tabIndex || -1
                    activate = 'mousedown'
                    abandon = 'mouseup'
                    var fn0 = $elem.bind('mouseleave', function() {
                        $elem.removeClass(expr[0])
                    })
                }
            }

            var fn1 = $elem.bind(activate, function() {
                $elem.addClass(expr[0])
            })
            var fn2 = $elem.bind(abandon, function() {
                $elem.removeClass(expr[0])
            })
            binding.rollback = function() {
                $elem.unbind('mouseleave', fn0)
                $elem.unbind(activate, fn1)
                $elem.unbind(abandon, fn2)
            }
            binding.hasBindEvent = true
        }
    },
    update: function(val) {
        if (this.type !== 'class') {
            return
        }
        var obj = val
        if (!obj || this.param)
            return log(
                'class指令语法错误 %c %s="%s"',
                'color:#f00',
                this.name,
                this.expr
            )

        if (typeof obj === 'string') {
            obj = {}
            obj[val] = true
        }

        if (!yua.isPlainObject(obj)) {
            obj = obj.$model
        }

        var $elem = yua(this.element)
        for (var i in obj) {
            $elem.toggleClass(i, !!obj[i])
        }
    }
})

'hover,active'.replace(rword, function(name) {
    directives[name] = directives['class']
})

//样式定义 :css-width="200"
//:css="{width: 200}"
yua.directive('css', {
    init: directives.attr.init,
    update: function(val) {
        var $elem = yua(this.element)
        if (!this.param) {
            var obj = val
            try {
                if (typeof val === 'object') {
                    if (!yua.isPlainObject(val)) obj = val.$model
                } else {
                    obj = new Function('return ' + val)()
                }
                for (var i in obj) {
                    $elem.css(i, obj[i])
                }
            } catch (err) {
                log(
                    '样式格式错误 %c %s="%s"',
                    'color:#f00',
                    this.name,
                    this.expr
                )
            }
        } else {
            $elem.css(this.param, val)
        }
    }
})

//兼容2种写法 :data-xx="yy", :data="{xx: yy}"
yua.directive('data', {
    priority: 100,
    update: function(val) {
        var obj = val
        if (typeof obj === 'object' && obj !== null) {
            if (!yua.isPlainObject(obj)) obj = val.$model

            for (var i in obj) {
                this.element.setAttribute('data-' + i, obj[i])
            }
        } else {
            if (!this.param) return

            this.element.setAttribute('data-' + this.param, obj)
        }
    }
})

/*------ 表单验证 -------*/
var __rules = {}
yua.validate = function(key) {
    return (
        !__rules[key] ||
        __rules[key].every(function(it) {
            return it.checked
        })
    )
}
yua.directive('rule', {
    priority: 2010,
    init: function(binding) {
        if (binding.param && !__rules[binding.param]) {
            __rules[binding.param] = []
        }
        binding.target = __rules[binding.param]
    },
    update: function(obj) {
        var _this = this,
            elem = this.element,
            ruleID = -1

        if (!['INPUT', 'TEXTAREA'].includes(elem.nodeName)) return

        if (this.target) {
            ruleID = this.target.length
            this.target.push({ checked: true })
        }

        //如果父级元素没有定位属性,则加上相对定位
        if (getComputedStyle(elem.parentNode).position === 'static') {
            elem.parentNode.style.position = 'relative'
        }

        var $elem = yua(elem),
            ol = elem.offsetLeft + elem.offsetWidth - 50,
            ot = elem.offsetTop + elem.offsetHeight + 8,
            tips = document.createElement('div')

        tips.className = 'do-rule-tips'
        tips.style.left = ol + 'px'
        tips.style.bottom = ot + 'px'

        function checked(ev) {
            var txt = '',
                val = elem.value

            if (obj.require && (val === '' || val === null)) txt = '必填项'

            if (!txt && obj.isNumeric)
                txt = !isFinite(val) ? '必须为合法数字' : ''

            if (!txt && obj.isEmail)
                txt = !/^[\w\.\-]+@\w+([\.\-]\w+)*\.\w+$/.test(val)
                    ? 'Email格式错误'
                    : ''

            if (!txt && obj.isPhone)
                txt = !/^1[34578]\d{9}$/.test(val) ? '手机格式错误' : ''

            if (!txt && obj.isCN)
                txt = !/^[\u4e00-\u9fa5]+$/.test(val) ? '必须为纯中文' : ''

            if (!txt && obj.exp)
                txt = !obj.exp.test(val) ? obj.msg || '格式错误' : ''

            if (!txt && obj.maxLen)
                txt =
                    val.length > obj.maxLen
                        ? '长度不得超过' + obj.maxLen + '位'
                        : ''

            if (!txt && obj.minLen)
                txt =
                    val.length < obj.minLen
                        ? '长度不得小于' + obj.minLen + '位'
                        : ''

            if (!txt && obj.hasOwnProperty('max'))
                txt = val > obj.max ? '输入值不能大于' + obj.max : ''

            if (!txt && obj.hasOwnProperty('min'))
                txt = val < obj.min ? '输入值不能小于' + obj.min : ''

            if (!txt && obj.eq) {
                var eqEl = document.querySelector('#' + obj.eq)
                txt = val !== eqEl.value ? obj.msg || '2次值不一致' : ''
            }

            if (txt) {
                if (ev) {
                    tips.textContent = txt
                    elem.parentNode.appendChild(tips)
                }
                //必须是"必填项"才会更新验证状态
                if (_this.target && obj.require) {
                    _this.target[ruleID].checked = false
                }
            } else {
                if (_this.target) {
                    _this.target[ruleID].checked = true
                }
                try {
                    elem.parentNode.removeChild(tips)
                } catch (err) {}
            }
        }

        $elem.bind('change,blur', checked)
        $elem.bind('focus', function(ev) {
            try {
                elem.parentNode.removeChild(tips)
            } catch (err) {}
        })

        checked()
    }
})

//双工绑定
var rduplexType = /^(?:checkbox|radio)$/
var rduplexParam = /^(?:radio|checked)$/
var rnoduplexInput = /^(file|button|reset|submit|checkbox|radio|range)$/
var duplexBinding = yua.directive('duplex', {
    priority: 2000,
    init: function(binding, hasCast) {
        var elem = binding.element
        var vmodels = binding.vmodels
        binding.changed =
            getBindingCallback(elem, 'data-duplex-changed', vmodels) || noop
        var params = []
        var casting = oneObject('string,number,boolean,checked')
        if (elem.type === 'radio' && binding.param === '') {
            binding.param = 'checked'
        }

        binding.param.replace(rw20g, function(name) {
            if (rduplexType.test(elem.type) && rduplexParam.test(name)) {
                if (name === 'radio')
                    log(':duplex-radio已经更名为:duplex-checked')
                name = 'checked'
                binding.isChecked = true
                binding.xtype = 'radio'
            }
            if (name === 'bool') {
                name = 'boolean'
                log(':duplex-bool已经更名为:duplex-boolean')
            } else if (name === 'text') {
                name = 'string'
                log(':duplex-text已经更名为:duplex-string')
            }
            if (casting[name]) {
                hasCast = true
            }
            yua.Array.ensure(params, name)
        })
        if (!hasCast) {
            params.push('string')
        }
        binding.param = params.join('-')
        if (!binding.xtype) {
            binding.xtype =
                elem.tagName === 'SELECT'
                    ? 'select'
                    : elem.type === 'checkbox'
                      ? 'checkbox'
                      : elem.type === 'radio'
                        ? 'radio'
                        : /^change/.test(elem.getAttribute('data-duplex-event'))
                          ? 'change'
                          : 'input'
        }
        //===================绑定事件======================
        var bound = (binding.bound = function(type, callback) {
            elem.addEventListener(type, callback, false)
            var old = binding.rollback
            binding.rollback = function() {
                elem.yuaSetter = null
                yua.unbind(elem, type, callback)
                old && old()
            }
        })
        function callback(value) {
            binding.changed.call(this, value, binding)
        }
        var composing = false
        function compositionStart() {
            composing = true
        }
        function compositionEnd() {
            composing = false
            setTimeout(updateVModel)
        }
        var updateVModel = function(e) {
            var val = elem.value
            //防止递归调用形成死循环
            //处理中文输入法在minlengh下引发的BUG
            if (
                composing ||
                val === binding.oldValue ||
                binding.pipe === null
            ) {
                return
            }

            var lastValue = binding.pipe(val, binding, 'get')
            binding.oldValue = val
            binding.setter(lastValue)

            callback.call(elem, lastValue)
            yua.fireDom(elem, 'change')
        }
        switch (binding.xtype) {
            case 'radio':
                bound('click', function() {
                    var lastValue = binding.pipe(elem.value, binding, 'get')
                    binding.setter(lastValue)
                    callback.call(elem, lastValue)
                })
                break
            case 'checkbox':
                bound('change', function() {
                    var method = elem.checked ? 'ensure' : 'remove'
                    var array = binding.getter.apply(0, binding.vmodels)
                    if (!Array.isArray(array)) {
                        log(':duplex应用于checkbox上要对应一个数组')
                        array = [array]
                    }
                    var val = binding.pipe(elem.value, binding, 'get')
                    yua.Array[method](array, val)
                    callback.call(elem, array)
                })
                break
            case 'change':
                bound('change', updateVModel)
                break
            case 'input':
                bound('input', updateVModel)
                bound('keyup', updateVModel)
                if (!IEVersion) {
                    bound('compositionstart', compositionStart)
                    bound('compositionend', compositionEnd)
                    bound('DOMAutoComplete', updateVModel)
                }
                break
            case 'select':
                bound('change', function() {
                    var val = yua(elem).val() //字符串或字符串数组
                    if (Array.isArray(val)) {
                        val = val.map(function(v) {
                            return binding.pipe(v, binding, 'get')
                        })
                    } else {
                        val = binding.pipe(val, binding, 'get')
                    }
                    if (val + '' !== binding.oldValue) {
                        try {
                            binding.setter(val)
                        } catch (ex) {
                            log(ex)
                        }
                    }
                })
                bound('datasetchanged', function(e) {
                    if (e.bubble === 'selectDuplex') {
                        var value = binding._value
                        var curValue = Array.isArray(value)
                            ? value.map(String)
                            : value + ''
                        yua(elem).val(curValue)
                        elem.oldValue = curValue + ''
                        callback.call(elem, curValue)
                    }
                })
                break
        }
        if (binding.xtype === 'input' && !rnoduplexInput.test(elem.type)) {
            if (elem.type !== 'hidden') {
                bound('focus', function() {
                    elem.msFocus = true
                })
                bound('blur', function() {
                    elem.msFocus = false
                })
            }
            elem.yuaSetter = updateVModel //#765
            watchValueInTimer(function() {
                if (root.contains(elem)) {
                    if (!elem.msFocus) {
                        updateVModel()
                    }
                } else if (!elem.msRetain) {
                    return false
                }
            })
        }
    },
    update: function(value) {
        var elem = this.element,
            binding = this,
            curValue
        if (!this.init) {
            for (var i in yua.vmodels) {
                var v = yua.vmodels[i]
                v.$fire('yua-duplex-init', binding)
            }
            var cpipe = binding.pipe || (binding.pipe = pipe)
            cpipe(null, binding, 'init')
            this.init = 1
        }
        switch (this.xtype) {
            case 'input':
                elem.value = value
                break
            case 'change':
                curValue = this.pipe(value, this, 'set') //fix #673
                if (curValue !== this.oldValue) {
                    var fixCaret = false
                    if (elem.msFocus) {
                        try {
                            var start = elem.selectionStart
                            var end = elem.selectionEnd
                            if (start === end) {
                                var pos = start
                                fixCaret = true
                            }
                        } catch (e) {}
                    }
                    elem.value = this.oldValue = curValue
                    if (fixCaret && !elem.readOnly) {
                        elem.selectionStart = elem.selectionEnd = pos
                    }
                }
                break
            case 'radio':
                curValue = binding.isChecked
                    ? !!value
                    : value + '' === elem.value
                elem.checked = curValue
                break
            case 'checkbox':
                var array = [].concat(value) //强制转换为数组
                curValue = this.pipe(elem.value, this, 'get')
                elem.checked = array.indexOf(curValue) > -1
                break
            case 'select':
                //必须变成字符串后才能比较
                binding._value = value
                if (!elem.msHasEvent) {
                    elem.msHasEvent = 'selectDuplex'
                    //必须等到其孩子准备好才触发
                } else {
                    yua.fireDom(elem, 'datasetchanged', {
                        bubble: elem.msHasEvent
                    })
                }
                break
        }
    }
})

function fixNull(val) {
    return val == null ? '' : val
}
yua.duplexHooks = {
    checked: {
        get: function(val, binding) {
            return !binding.oldValue
        }
    },
    string: {
        get: function(val) {
            //同步到VM
            return val
        },
        set: fixNull
    },
    boolean: {
        get: function(val) {
            return val === 'true'
        },
        set: fixNull
    },
    number: {
        get: function(val, binding) {
            var number = val - 0
            if (-val === -number) {
                return number
            }
            var arr = /strong|medium|weak/.exec(
                binding.element.getAttribute('data-duplex-number')
            ) || ['medium']
            switch (arr[0]) {
                case 'strong':
                    return 0
                case 'medium':
                    return val === '' ? '' : 0
                case 'weak':
                    return val
            }
        },
        set: fixNull
    }
}

function pipe(val, binding, action, e) {
    binding.param.replace(rw20g, function(name) {
        var hook = yua.duplexHooks[name]
        if (hook && typeof hook[action] === 'function') {
            val = hook[action](val, binding)
        }
    })
    return val
}

var TimerID,
    ribbon = []

yua.tick = function(fn) {
    if (ribbon.push(fn) === 1) {
        TimerID = setInterval(ticker, 60)
    }
}

function ticker() {
    for (var n = ribbon.length - 1; n >= 0; n--) {
        var el = ribbon[n]
        if (el() === false) {
            ribbon.splice(n, 1)
        }
    }
    if (!ribbon.length) {
        clearInterval(TimerID)
    }
}

var watchValueInTimer = noop
new function() {
    // jshint ignore:line
    try {
        //#272 IE9-IE11, firefox
        var setters = {}
        var aproto = HTMLInputElement.prototype
        var bproto = HTMLTextAreaElement.prototype
        function newSetter(value) {
            // jshint ignore:line
            setters[this.tagName].call(this, value)
            if (!this.msFocus && this.yuaSetter) {
                this.yuaSetter()
            }
        }
        var inputProto = HTMLInputElement.prototype
        Object.getOwnPropertyNames(inputProto) //故意引发IE6-8等浏览器报错
        setters['INPUT'] = Object.getOwnPropertyDescriptor(aproto, 'value').set

        Object.defineProperty(aproto, 'value', {
            set: newSetter
        })
        setters['TEXTAREA'] = Object.getOwnPropertyDescriptor(
            bproto,
            'value'
        ).set
        Object.defineProperty(bproto, 'value', {
            set: newSetter
        })
    } catch (e) {
        //在chrome 43中 :duplex终于不需要使用定时器实现双向绑定了
        // http://updates.html5rocks.com/2015/04/DOM-attributes-now-on-the-prototype
        // https://docs.google.com/document/d/1jwA8mtClwxI-QJuHT7872Z0pxpZz8PBkf2bGAbsUtqs/edit?pli=1
        watchValueInTimer = yua.tick
    }
}() // jshint ignore:line

/*-------------动画------------*/

yua.directive('effect', {
    priority: 5,
    init: function(binding) {
        var text = binding.expr,
            className,
            rightExpr
        var colonIndex = text
            .replace(rexprg, function(a) {
                return a.replace(/./g, '0')
            })
            .indexOf(':') //取得第一个冒号的位置
        if (colonIndex === -1) {
            // 比如 :class/effect="aaa bbb ccc" 的情况
            className = text
            rightExpr = true
        } else {
            // 比如 :class/effect-1="ui-state-active:checked" 的情况
            className = text.slice(0, colonIndex)
            rightExpr = text.slice(colonIndex + 1)
        }
        if (!rexpr.test(text)) {
            className = quote(className)
        } else {
            className = normalizeExpr(className)
        }
        binding.expr = '[' + className + ',' + rightExpr + ']'
    },
    update: function(arr) {
        var name = arr[0]
        var elem = this.element
        if (elem.getAttribute('data-effect-name') === name) {
            return
        } else {
            elem.removeAttribute('data-effect-driver')
        }
        var inlineStyles = elem.style
        var computedStyles = window.getComputedStyle
            ? window.getComputedStyle(elem)
            : null
        var useAni = false
        if (computedStyles && (supportTransition || supportAnimation)) {
            //如果支持CSS动画
            var duration =
                inlineStyles[transitionDuration] ||
                computedStyles[transitionDuration]
            if (duration && duration !== '0s') {
                elem.setAttribute('data-effect-driver', 't')
                useAni = true
            }

            if (!useAni) {
                duration =
                    inlineStyles[animationDuration] ||
                    computedStyles[animationDuration]
                if (duration && duration !== '0s') {
                    elem.setAttribute('data-effect-driver', 'a')
                    useAni = true
                }
            }
        }

        if (!useAni) {
            if (yua.effects[name]) {
                elem.setAttribute('data-effect-driver', 'j')
                useAni = true
            }
        }
        if (useAni) {
            elem.setAttribute('data-effect-name', name)
        }
    }
})

yua.effects = {}
yua.effect = function(name, callbacks) {
    yua.effects[name] = callbacks
}

var supportTransition = false
var supportAnimation = false

var transitionEndEvent
var animationEndEvent
var transitionDuration = yua.cssName('transition-duration')
var animationDuration = yua.cssName('animation-duration')
new function() {
    // jshint ignore:line
    var checker = {
        TransitionEvent: 'transitionend',
        WebKitTransitionEvent: 'webkitTransitionEnd',
        OTransitionEvent: 'oTransitionEnd',
        otransitionEvent: 'otransitionEnd'
    }
    var tran
    //有的浏览器同时支持私有实现与标准写法，比如webkit支持前两种，Opera支持1、3、4
    for (var name in checker) {
        if (window[name]) {
            tran = checker[name]
            break
        }
        try {
            var a = document.createEvent(name)
            tran = checker[name]
            break
        } catch (e) {}
    }
    if (typeof tran === 'string') {
        supportTransition = true
        transitionEndEvent = tran
    }

    //大致上有两种选择
    //IE10+, Firefox 16+ & Opera 12.1+: animationend
    //Chrome/Safari: webkitAnimationEnd
    //http://blogs.msdn.com/b/davrous/archive/2011/12/06/introduction-to-css3-animat ions.aspx
    //IE10也可以使用MSAnimationEnd监听，但是回调里的事件 type依然为animationend
    //  el.addEventListener("MSAnimationEnd", function(e) {
    //     alert(e.type)// animationend！！！
    // })
    checker = {
        AnimationEvent: 'animationend',
        WebKitAnimationEvent: 'webkitAnimationEnd'
    }
    var ani
    for (name in checker) {
        if (window[name]) {
            ani = checker[name]
            break
        }
    }
    if (typeof ani === 'string') {
        supportTransition = true
        animationEndEvent = ani
    }
}()

var effectPool = [] //重复利用动画实例
function effectFactory(el, opts) {
    if (!el || el.nodeType !== 1) {
        return null
    }
    if (opts) {
        var name = opts.effectName
        var driver = opts.effectDriver
    } else {
        name = el.getAttribute('data-effect-name')
        driver = el.getAttribute('data-effect-driver')
    }
    if (!name || !driver) {
        return null
    }

    var instance = effectPool.pop() || new Effect()
    instance.el = el
    instance.driver = driver
    instance.useCss = driver !== 'j'
    if (instance.useCss) {
        opts && yua(el).addClass(opts.effectClass)
        instance.cssEvent =
            driver === 't' ? transitionEndEvent : animationEndEvent
    }
    instance.name = name
    instance.callbacks = yua.effects[name] || {}

    return instance
}

function effectBinding(elem, binding) {
    var name = elem.getAttribute('data-effect-name')
    if (name) {
        binding.effectName = name
        binding.effectDriver = elem.getAttribute('data-effect-driver')
        var stagger = +elem.getAttribute('data-effect-stagger')
        binding.effectLeaveStagger =
            +elem.getAttribute('data-effect-leave-stagger') || stagger
        binding.effectEnterStagger =
            +elem.getAttribute('data-effect-enter-stagger') || stagger
        binding.effectClass = elem.className || NaN
    }
}
function upperFirstChar(str) {
    return str.replace(/^[\S]/g, function(m) {
        return m.toUpperCase()
    })
}
var effectBuffer = new Buffer()
function Effect() {} //动画实例,做成类的形式,是为了共用所有原型方法

Effect.prototype = {
    contrustor: Effect,
    enterClass: function() {
        return getEffectClass(this, 'enter')
    },
    leaveClass: function() {
        return getEffectClass(this, 'leave')
    },
    // 共享一个函数
    actionFun: function(name, before, after) {
        if (document.hidden) {
            return
        }
        var me = this
        var el = me.el
        var isLeave = name === 'leave'
        name = isLeave ? 'leave' : 'enter'
        var oppositeName = isLeave ? 'enter' : 'leave'
        callEffectHook(me, 'abort' + upperFirstChar(oppositeName))
        callEffectHook(me, 'before' + upperFirstChar(name))
        if (!isLeave) before(el) //这里可能做插入DOM树的操作,因此必须在修改类名前执行
        var cssCallback = function(cancel) {
            el.removeEventListener(me.cssEvent, me.cssCallback)
            if (isLeave) {
                before(el) //这里可能做移出DOM树操作,因此必须位于动画之后
                yua(el).removeClass(me.cssClass)
            } else {
                if (me.driver === 'a') {
                    yua(el).removeClass(me.cssClass)
                }
            }
            if (cancel !== true) {
                callEffectHook(me, 'after' + upperFirstChar(name))
                after && after(el)
            }
            me.dispose()
        }
        if (me.useCss) {
            if (me.cssCallback) {
                //如果leave动画还没有完成,立即完成
                me.cssCallback(true)
            }

            me.cssClass = getEffectClass(me, name)
            me.cssCallback = cssCallback

            me.update = function() {
                el.addEventListener(me.cssEvent, me.cssCallback)
                if (!isLeave && me.driver === 't') {
                    //transtion延迟触发
                    yua(el).removeClass(me.cssClass)
                }
            }
            yua(el).addClass(me.cssClass) //animation会立即触发

            effectBuffer.render(true)
            effectBuffer.queue.push(me)
        } else {
            callEffectHook(me, name, cssCallback)
        }
    },
    enter: function(before, after) {
        this.actionFun.apply(this, ['enter'].concat(yua.slice(arguments)))
    },
    leave: function(before, after) {
        this.actionFun.apply(this, ['leave'].concat(yua.slice(arguments)))
    },
    dispose: function() {
        //销毁与回收到池子中
        this.update = this.cssCallback = null
        if (effectPool.unshift(this) > 100) {
            effectPool.pop()
        }
    }
}

function getEffectClass(instance, type) {
    var a = instance.callbacks[type + 'Class']
    if (typeof a === 'string') return a
    if (typeof a === 'function') return a()
    return instance.name + '-' + type
}

function callEffectHook(effect, name, cb) {
    var hook = effect.callbacks[name]
    if (hook) {
        hook.call(effect, effect.el, cb)
    }
}

var applyEffect = function(el, dir /*[before, [after, [opts]]]*/) {
    var args = aslice.call(arguments, 0)
    if (typeof args[2] !== 'function') {
        args.splice(2, 0, noop)
    }
    if (typeof args[3] !== 'function') {
        args.splice(3, 0, noop)
    }
    var before = args[2]
    var after = args[3]
    var opts = args[4]
    var effect = effectFactory(el, opts)
    if (!effect) {
        before()
        after()
        return false
    } else {
        var method = dir ? 'enter' : 'leave'
        effect[method](before, after)
    }
}

yua.mix(yua.effect, {
    apply: applyEffect,
    append: function(el, parent, after, opts) {
        return applyEffect(
            el,
            1,
            function() {
                parent.appendChild(el)
            },
            after,
            opts
        )
    },
    before: function(el, target, after, opts) {
        return applyEffect(
            el,
            1,
            function() {
                target.parentNode.insertBefore(el, target)
            },
            after,
            opts
        )
    },
    remove: function(el, parent, after, opts) {
        return applyEffect(
            el,
            0,
            function() {
                if (el.parentNode === parent) parent.removeChild(el)
            },
            after,
            opts
        )
    }
})

yua.directive('html', {
    update: function(val) {
        var binding = this
        var elem = this.element
        var isHtmlFilter = elem.nodeType !== 1
        var parent = isHtmlFilter ? elem.parentNode : elem
        if (!parent) return
        val = val == null ? '' : val

        if (elem.nodeType === 3) {
            var signature = generateID('html')
            parent.insertBefore(DOC.createComment(signature), elem)
            binding.element = DOC.createComment(signature + ':end')
            parent.replaceChild(binding.element, elem)
            elem = binding.element
        }
        if (typeof val !== 'object') {
            //string, number, boolean
            var fragment = yua.parseHTML(String(val))
        } else if (val.nodeType === 11) {
            //将val转换为文档碎片
            fragment = val
        } else if (val.nodeType === 1 || val.item) {
            var nodes = val.nodeType === 1 ? val.childNodes : val.item
            fragment = yuaFragment.cloneNode(true)
            while (nodes[0]) {
                fragment.appendChild(nodes[0])
            }
        }

        nodes = yua.slice(fragment.childNodes)
        //插入占位符, 如果是过滤器,需要有节制地移除指定的数量,如果是html指令,直接清空
        if (isHtmlFilter) {
            var endValue = elem.nodeValue.slice(0, -4)
            while (true) {
                var node = elem.previousSibling
                if (
                    !node ||
                    (node.nodeType === 8 && node.nodeValue === endValue)
                ) {
                    break
                } else {
                    parent.removeChild(node)
                }
            }
            parent.insertBefore(fragment, elem)
        } else {
            yua.clearHTML(elem).appendChild(fragment)
        }
        scanNodeArray(nodes, binding.vmodels)
    }
})

yua.directive('if', {
    priority: 10,
    update: function(val) {
        var binding = this
        var elem = this.element
        var stamp = (binding.stamp = +new Date())
        var par
        var after = function() {
            if (stamp !== binding.stamp) return
            binding.recoverNode = null
        }
        if (binding.recoverNode) binding.recoverNode() // 还原现场，有移动节点的都需要还原现场
        try {
            if (!elem.parentNode) return
            par = elem.parentNode
        } catch (e) {
            return
        }
        if (val) {
            //插回DOM树
            function alway() {
                // jshint ignore:line
                if (elem.getAttribute(binding.name)) {
                    elem.removeAttribute(binding.name)
                    scanAttr(elem, binding.vmodels)
                }
                binding.rollback = null
            }
            if (elem.nodeType === 8) {
                var keep = binding.keep
                var hasEffect = yua.effect.apply(
                    keep,
                    1,
                    function() {
                        if (stamp !== binding.stamp) return
                        elem.parentNode.replaceChild(keep, elem)
                        elem = binding.element = keep //这时可能为null
                        if (keep.getAttribute('_required')) {
                            //#1044
                            elem.required = true
                            elem.removeAttribute('_required')
                        }
                        if (elem.querySelectorAll) {
                            yua.each(
                                elem.querySelectorAll('[_required=true]'),
                                function(el) {
                                    el.required = true
                                    el.removeAttribute('_required')
                                }
                            )
                        }
                        alway()
                    },
                    after
                )
                hasEffect = hasEffect === false
            }
            if (!hasEffect) alway()
        } else {
            //移出DOM树，并用注释节点占据原位置
            if (elem.nodeType === 1) {
                if (elem.required === true) {
                    elem.required = false
                    elem.setAttribute('_required', 'true')
                }
                try {
                    //如果不支持querySelectorAll或:required,可以直接无视
                    yua.each(elem.querySelectorAll(':required'), function(el) {
                        elem.required = false
                        el.setAttribute('_required', 'true')
                    })
                } catch (e) {}

                var node = (binding.element = DOC.createComment(':if')),
                    pos = elem.nextSibling
                binding.recoverNode = function() {
                    binding.recoverNode = null
                    if (node.parentNode !== par) {
                        par.insertBefore(node, pos)
                        binding.keep = elem
                    }
                }

                yua.effect.apply(
                    elem,
                    0,
                    function() {
                        binding.recoverNode = null
                        if (stamp !== binding.stamp) return
                        elem.parentNode.replaceChild(node, elem)
                        binding.keep = elem //元素节点
                        ifGroup.appendChild(elem)
                        binding.rollback = function() {
                            if (elem.parentNode === ifGroup) {
                                ifGroup.removeChild(elem)
                            }
                        }
                    },
                    after
                )
            }
        }
    }
})

//:important绑定已经在scanTag 方法中实现
var rnoscripts = /<noscript.*?>(?:[\s\S]+?)<\/noscript>/gim
var rnoscriptText = /<noscript.*?>([\s\S]+?)<\/noscript>/im

var getXHR = function() {
    return new window.XMLHttpRequest() // jshint ignore:line
}
//将所有远程加载的模板,以字符串形式存放到这里
var templatePool = (yua.templateCache = {})

function getTemplateContainer(binding, id, text) {
    var div = binding.templateCache && binding.templateCache[id]
    if (div) {
        var dom = DOC.createDocumentFragment(),
            firstChild
        while ((firstChild = div.firstChild)) {
            dom.appendChild(firstChild)
        }
        return dom
    }
    return yua.parseHTML(text)
}
function nodesToFrag(nodes) {
    var frag = DOC.createDocumentFragment()
    for (var i = 0, len = nodes.length; i < len; i++) {
        frag.appendChild(nodes[i])
    }
    return frag
}
yua.directive('include', {
    init: directives.attr.init,
    update: function(val) {
        var binding = this
        var elem = this.element
        var vmodels = binding.vmodels
        var rendered = binding.includeRendered
        var effectClass = binding.effectName && binding.effectClass // 是否开启动画
        var templateCache = binding.templateCache // 是否data-include-cache
        var outer = binding.includeReplace // 是否data-include-replace
        var loaded = binding.includeLoaded
        var target = outer ? elem.parentNode : elem
        var _ele = binding._element // data-include-replace binding.element === binding.end

        binding.recoverNodes = binding.recoverNodes || yua.noop

        var scanTemplate = function(text) {
            var _stamp = (binding._stamp = +new Date()) // 过滤掉频繁操作
            if (loaded) {
                var newText = loaded.apply(target, [text].concat(vmodels))
                if (typeof newText === 'string') text = newText
            }
            if (rendered) {
                checkScan(
                    target,
                    function() {
                        rendered.call(target)
                    },
                    NaN
                )
            }
            var lastID = binding.includeLastID || '_default' // 默认

            binding.includeLastID = val
            var leaveEl =
                (templateCache && templateCache[lastID]) ||
                DOC.createElement(elem.tagName || binding._element.tagName) // 创建一个离场元素

            if (effectClass) {
                leaveEl.className = effectClass
                target.insertBefore(leaveEl, binding.start) // 插入到start之前，防止被错误的移动
            }

            // cache or animate，移动节点
            ;(templateCache || {})[lastID] = leaveEl
            var fragOnDom = binding.recoverNodes() // 恢复动画中的节点
            if (fragOnDom) {
                target.insertBefore(fragOnDom, binding.end)
            }
            while (true) {
                var node = binding.start.nextSibling
                if (node && node !== leaveEl && node !== binding.end) {
                    leaveEl.appendChild(node)
                } else {
                    break
                }
            }

            // 元素退场
            yua.effect.remove(
                leaveEl,
                target,
                function() {
                    if (templateCache) {
                        // write cache
                        if (_stamp === binding._stamp)
                            ifGroup.appendChild(leaveEl)
                    }
                },
                binding
            )

            var enterEl = target,
                before = yua.noop,
                after = yua.noop

            var fragment = getTemplateContainer(binding, val, text)
            var nodes = yua.slice(fragment.childNodes)

            if (outer && effectClass) {
                enterEl = _ele
                enterEl.innerHTML = '' // 清空
                enterEl.setAttribute(':skip', 'true')
                target.insertBefore(enterEl, binding.end.nextSibling) // 插入到bingding.end之后避免被错误的移动
                before = function() {
                    enterEl.insertBefore(fragment, null) // 插入节点
                }
                after = function() {
                    binding.recoverNodes = yua.noop
                    if (_stamp === binding._stamp) {
                        fragment = nodesToFrag(nodes)
                        target.insertBefore(fragment, binding.end) // 插入真实element
                        scanNodeArray(nodes, vmodels)
                    }
                    if (enterEl.parentNode === target)
                        target.removeChild(enterEl) // 移除入场动画元素
                }
                binding.recoverNodes = function() {
                    binding.recoverNodes = yua.noop
                    return nodesToFrag(nodes)
                }
            } else {
                before = function() {
                    //新添加元素的动画
                    target.insertBefore(fragment, binding.end)
                    scanNodeArray(nodes, vmodels)
                }
            }

            yua.effect.apply(enterEl, 'enter', before, after)
        }

        if (!val) return

        var el = val

        if (typeof el === 'object') {
            if (el.nodeType !== 1) return log('include 不支持非DOM对象')
        } else {
            el = DOC.getElementById(val)
            if (!el) {
                if (typeof templatePool[val] === 'string') {
                    yua.nextTick(function() {
                        scanTemplate(templatePool[val])
                    })
                } else if (Array.isArray(templatePool[val])) {
                    //#805 防止在循环绑定中发出许多相同的请求
                    templatePool[val].push(scanTemplate)
                } else {
                    var xhr = getXHR()
                    xhr.onload = function() {
                        if (xhr.status !== 200)
                            return log(
                                '获取网络资源出错, httpError[' +
                                    xhr.status +
                                    ']'
                            )

                        var text = xhr.responseText
                        for (var f = 0, fn; (fn = templatePool[val][f++]); ) {
                            fn(text)
                        }
                        templatePool[val] = text
                    }
                    xhr.onerror = function() {
                        log(':include load [' + val + '] error')
                    }
                    templatePool[val] = [scanTemplate]
                    xhr.open('GET', val, true)
                    if ('withCredentials' in xhr) {
                        xhr.withCredentials = true
                    }
                    xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest')
                    xhr.send(null)
                }
                return
            }
        }

        yua.nextTick(function() {
            scanTemplate(el.value || el.innerText || el.innerHTML)
        })
    }
})

var rdash = /\(([^)]*)\)/
var onDir = yua.directive('on', {
    priority: 3000,
    init: function(binding) {
        var value = binding.expr
        binding.type = 'on'
        var eventType = binding.param.replace(/-\d+$/, '') // :on-mousemove-10
        if (typeof onDir[eventType + 'Hook'] === 'function') {
            onDir[eventType + 'Hook'](binding)
        }
        if (value.indexOf('(') > 0 && value.indexOf(')') > -1) {
            var matched = (value.match(rdash) || ['', ''])[1].trim()
            if (matched === '' || matched === '$event') {
                // aaa() aaa($event)当成aaa处理
                value = value.replace(rdash, '')
            }
        }
        binding.expr = value
    },
    update: function(callback) {
        var binding = this
        var elem = this.element
        callback = function(e) {
            var fn = binding.getter || noop
            return fn.apply(this, binding.args.concat(e))
        }

        var eventType = binding.param.replace(/-\d+$/, '') // :on-mousemove-10
        if (eventType === 'scan') {
            callback.call(elem, {
                type: eventType
            })
        } else if (typeof binding.specialBind === 'function') {
            binding.specialBind(elem, callback)
        } else {
            var removeFn = yua.bind(elem, eventType, callback)
        }
        binding.rollback = function() {
            if (typeof binding.specialUnbind === 'function') {
                binding.specialUnbind()
            } else {
                yua.unbind(elem, eventType, removeFn)
            }
        }
    }
})

yua.directive('repeat', {
    priority: 90,
    init: function(binding) {
        var type = binding.type
        binding.cache = {} //用于存放代理VM
        binding.enterCount = 0

        var elem = binding.element
        if (elem.nodeType === 1) {
            elem.removeAttribute(binding.name)
            effectBinding(elem, binding)
            binding.param = binding.param || 'el'
            binding.sortedCallback = getBindingCallback(
                elem,
                'data-repeat-sortby',
                binding.vmodels
            )
            var rendered = getBindingCallback(
                elem,
                'data-repeat-rendered',
                binding.vmodels
            )

            var signature = generateID(type)
            var start = DOC.createComment(signature + ':start')
            var end = (binding.element = DOC.createComment(signature + ':end'))
            binding.signature = signature
            binding.start = start
            binding.template = yuaFragment.cloneNode(false)

            var parent = elem.parentNode
            parent.replaceChild(end, elem)
            parent.insertBefore(start, end)
            binding.template.appendChild(elem)

            binding.element = end

            if (rendered) {
                var removeFn = yua.bind(parent, 'datasetchanged', function() {
                    rendered.apply(parent, parent.args)
                    yua.unbind(parent, 'datasetchanged', removeFn)
                    parent.msRendered = rendered
                })
            }
        }
    },
    update: function(value, oldValue) {
        var binding = this
        var xtype = this.xtype

        this.enterCount += 1
        var init = !oldValue
        if (init) {
            binding.$outer = {}
            var check0 = '$key'
            var check1 = '$val'
            if (xtype === 'array') {
                check0 = '$first'
                check1 = '$last'
            }
            for (var i = 0, v; (v = binding.vmodels[i++]); ) {
                if (v.hasOwnProperty(check0) && v.hasOwnProperty(check1)) {
                    binding.$outer = v
                    break
                }
            }
        }
        var track = this.track
        if (binding.sortedCallback) {
            //如果有回调，则让它们排序
            var keys2 = binding.sortedCallback.call(parent, track)
            if (keys2 && Array.isArray(keys2)) {
                track = keys2
            }
        }

        var action = 'move'
        binding.$repeat = value
        var fragments = []
        var transation = init && yuaFragment.cloneNode(false)
        var proxies = []
        var param = this.param
        var retain = yua.mix({}, this.cache)
        var elem = this.element
        var length = track.length

        var parent = elem.parentNode

        //检查新元素数量
        var newCount = 0
        for (i = 0; i < length; i++) {
            var keyOrId = track[i]
            if (!retain[keyOrId]) newCount++
        }
        var oldCount = 0
        for (i in retain) {
            oldCount++
        }
        var clear = (!length || newCount === length) && oldCount > 10 //当全部是新元素,且移除元素较多(10)时使用clear

        var kill = elem.previousSibling
        var start = binding.start

        /*log(kill === start, kill)
        while(kill !== start && kill.nodeName !== '#comment'){
            parent.removeChild(kill)
            kill = elem.previousSibling
        }*/
        if (clear) {
            while (kill !== start) {
                parent.removeChild(kill)
                kill = elem.previousSibling
            }
        }

        for (i = 0; i < length; i++) {
            keyOrId = track[i] //array为随机数, object 为keyName
            var proxy = retain[keyOrId]
            if (!proxy) {
                proxy = getProxyVM(this)
                proxy.$up = null
                if (xtype === 'array') {
                    action = 'add'
                    proxy.$id = keyOrId
                    var valueItem = value[i]
                    proxy[param] = valueItem //index
                    if (Object(valueItem) === valueItem) {
                        valueItem.$ups = valueItem.$ups || {}
                        valueItem.$ups[param] = proxy
                    }
                } else {
                    action = 'append'
                    proxy.$key = keyOrId
                    proxy.$val = value[keyOrId] //key
                    proxy[param] = { $key: proxy.$key, $val: proxy.$val }
                }
                this.cache[keyOrId] = proxy
                var node =
                    proxy.$anchor || (proxy.$anchor = elem.cloneNode(false))
                node.nodeValue = this.signature
                shimController(
                    binding,
                    transation,
                    proxy,
                    fragments,
                    init && !binding.effectDriver
                )
                decorateProxy(proxy, binding, xtype)
            } else {
                // if (xtype === "array") {
                //     proxy[param] = value[i]
                // }
                fragments.push({})
                retain[keyOrId] = true
            }

            //重写proxy
            if (this.enterCount === 1) {
                //防止多次进入,导致位置不对
                proxy.$active = false
                proxy.$oldIndex = proxy.$index
                proxy.$active = true
                proxy.$index = i
            }

            if (xtype === 'array') {
                proxy.$first = i === 0
                proxy.$last = i === length - 1
                // proxy[param] = value[i]
            } else {
                proxy.$val = toJson(value[keyOrId]) //这里是处理vm.object = newObject的情况
            }
            proxies.push(proxy)
        }
        this.proxies = proxies
        if (init && !binding.effectDriver) {
            parent.insertBefore(transation, elem)
            fragments.forEach(function(fragment) {
                scanNodeArray(fragment.nodes || [], fragment.vmodels)
                //if(fragment.vmodels.length > 2)
                fragment.nodes = fragment.vmodels = null
            }) // jshint ignore:line
        } else {
            var staggerIndex = (binding.staggerIndex = 0)
            for (keyOrId in retain) {
                if (retain[keyOrId] !== true) {
                    action = 'del'
                    !clear && removeItem(retain[keyOrId].$anchor, binding, true)
                    // 相当于delete binding.cache[key]
                    proxyRecycler(this.cache, keyOrId, param)
                    retain[keyOrId] = null
                }
            }

            for (i = 0; i < length; i++) {
                proxy = proxies[i]
                keyOrId = xtype === 'array' ? proxy.$id : proxy.$key
                var pre = proxies[i - 1]
                var preEl = pre ? pre.$anchor : binding.start
                if (!retain[keyOrId]) {
                    //如果还没有插入到DOM树,进行插入动画
                    ;(function(fragment, preElement) {
                        var nodes = fragment.nodes
                        var vmodels = fragment.vmodels
                        if (nodes) {
                            staggerIndex = mayStaggerAnimate(
                                binding.effectEnterStagger,
                                function() {
                                    parent.insertBefore(
                                        fragment.content,
                                        preElement.nextSibling
                                    )
                                    scanNodeArray(nodes, vmodels)
                                    !init && animateRepeat(nodes, 1, binding)
                                },
                                staggerIndex
                            )
                        }
                        fragment.nodes = fragment.vmodels = null
                    })(fragments[i], preEl) // jshint ignore:line
                } else if (proxy.$index !== proxy.$oldIndex) {
                    //进行移动动画
                    ;(function(proxy2, preElement) {
                        staggerIndex = mayStaggerAnimate(
                            binding.effectEnterStagger,
                            function() {
                                var curNode = removeItem(proxy2.$anchor)
                                var inserted = yua.slice(curNode.childNodes)
                                parent.insertBefore(
                                    curNode,
                                    preElement.nextSibling
                                )
                                animateRepeat(inserted, 1, binding)
                            },
                            staggerIndex
                        )
                    })(proxy, preEl) // jshint ignore:line
                }
            }
        }
        if (!value.$track) {
            //如果是非监控对象,那么就将其$events清空,阻止其持续监听
            for (keyOrId in this.cache) {
                proxyRecycler(this.cache, keyOrId, param)
            }
        }

        //repeat --> duplex
        ;(function(args) {
            parent.args = args
            if (parent.msRendered) {
                //第一次事件触发,以后直接调用
                parent.msRendered.apply(parent, args)
            }
        })(kernel.newWatch ? arguments : [action])
        var id = setTimeout(function() {
            clearTimeout(id)
            //触发上层的select回调及自己的rendered回调
            yua.fireDom(parent, 'datasetchanged', {
                bubble: parent.msHasEvent
            })
        })
        this.enterCount -= 1
    }
})

function animateRepeat(nodes, isEnter, binding) {
    for (var i = 0, node; (node = nodes[i++]); ) {
        if (node.className === binding.effectClass) {
            yua.effect.apply(node, isEnter, noop, noop, binding)
        }
    }
}

function mayStaggerAnimate(staggerTime, callback, index) {
    if (staggerTime) {
        setTimeout(callback, ++index * staggerTime)
    } else {
        callback()
    }
    return index
}

function removeItem(node, binding, flagRemove) {
    var fragment = yuaFragment.cloneNode(false)
    var last = node
    var breakText = last.nodeValue
    var staggerIndex = binding && Math.max(+binding.staggerIndex, 0)
    var nodes = yua.slice(last.parentNode.childNodes)
    var index = nodes.indexOf(last)
    while (true) {
        var pre = nodes[--index] //node.previousSibling
        if (!pre || String(pre.nodeValue).indexOf(breakText) === 0) {
            break
        }
        if (!flagRemove && binding && pre.className === binding.effectClass) {
            node = pre
            ;(function(cur) {
                binding.staggerIndex = mayStaggerAnimate(
                    binding.effectLeaveStagger,
                    function() {
                        yua.effect.apply(
                            cur,
                            0,
                            noop,
                            function() {
                                fragment.appendChild(cur)
                            },
                            binding
                        )
                    },
                    staggerIndex
                )
            })(pre) // jshint ignore:line
        } else {
            fragment.insertBefore(pre, fragment.firstChild)
        }
    }
    fragment.appendChild(last)
    return fragment
}

function shimController(data, transation, proxy, fragments, init) {
    var content = data.template.cloneNode(true)
    var nodes = yua.slice(content.childNodes)
    content.appendChild(proxy.$anchor)
    init && transation.appendChild(content)
    var itemName = data.param || 'el'
    var valueItem = proxy[itemName],
        nv

    nv = [proxy].concat(data.vmodels)

    var fragment = {
        nodes: nodes,
        vmodels: nv,
        content: content
    }
    fragments.push(fragment)
}
// {}  -->  {xx: 0, yy: 1, zz: 2} add
// {xx: 0, yy: 1, zz: 2}  -->  {xx: 0, yy: 1, zz: 2, uu: 3}
// [xx: 0, yy: 1, zz: 2}  -->  {xx: 0, zz: 1, yy: 2}

function getProxyVM(binding) {
    var agent = binding.xtype === 'object' ? withProxyAgent : eachProxyAgent
    var proxy = agent(binding)
    var node =
        proxy.$anchor || (proxy.$anchor = binding.element.cloneNode(false))
    node.nodeValue = binding.signature
    proxy.$outer = binding.$outer
    return proxy
}

function decorateProxy(proxy, binding, type) {
    if (type === 'array') {
        proxy.$remove = function() {
            binding.$repeat.removeAt(proxy.$index)
        }
        var param = binding.param
        proxy.$watch(param, function(a) {
            var index = proxy.$index
            binding.$repeat[index] = a
        })
    } else {
        proxy.$watch('$val', function fn(a) {
            binding.$repeat[proxy.$key] = a
        })
    }
}

var eachProxyPool = []

function eachProxyAgent(data, proxy) {
    var itemName = data.param || 'el'
    for (var i = 0, n = eachProxyPool.length; i < n; i++) {
        var candidate = eachProxyPool[i]
        if (candidate && candidate.hasOwnProperty(itemName)) {
            eachProxyPool.splice(i, 1)
            proxy = candidate
            break
        }
    }
    if (!proxy) {
        proxy = eachProxyFactory(itemName)
    }
    return proxy
}

function eachProxyFactory(itemName) {
    var source = {
        $outer: {},
        $index: 0,
        $oldIndex: 0,
        $anchor: null,
        //-----
        $first: false,
        $last: false,
        $remove: yua.noop
    }
    source[itemName] = NaN
    var force = {
        $last: 1,
        $first: 1,
        $index: 1
    }
    force[itemName] = 1
    var proxy = modelFactory(source, {
        force: force
    })
    proxy.$id = generateID('$proxy$each')
    return proxy
}

var withProxyPool = []

function withProxyAgent(data) {
    var itemName = data.param || 'el'
    return withProxyPool.pop() || withProxyFactory(itemName)
}

function withProxyFactory(itemName) {
    var source = {
        $key: '',
        $val: NaN,
        $index: 0,
        $oldIndex: 0,
        $outer: {},
        $anchor: null
    }
    source[itemName] = NaN
    var force = {
        $key: 1,
        $val: 1,
        $index: 1
    }
    force[itemName] = 1
    var proxy = modelFactory(source, {
        force: force
    })
    proxy.$id = generateID('$proxy$with')
    return proxy
}

function proxyRecycler(cache, key, param) {
    var proxy = cache[key]
    if (proxy) {
        var proxyPool =
            proxy.$id.indexOf('$proxy$each') === 0
                ? eachProxyPool
                : withProxyPool
        proxy.$outer = {}

        for (var i in proxy.$events) {
            var a = proxy.$events[i]
            if (Array.isArray(a)) {
                a.length = 0
                if (i === param) {
                    proxy[param] = NaN
                } else if (i === '$val') {
                    proxy.$val = NaN
                }
            }
        }

        if (proxyPool.unshift(proxy) > kernel.maxRepeatSize) {
            proxyPool.pop()
        }
        delete cache[key]
    }
}

/*********************************************************************
 *                         各种指令                                  *
 **********************************************************************/

//:skip绑定已经在scanTag 方法中实现
yua.directive('text', {
    update: function(val) {
        var elem = this.element
        val = val == null ? '' : val //不在页面上显示undefined null
        if (elem.nodeType === 3) {
            //绑定在文本节点上
            try {
                //IE对游离于DOM树外的节点赋值会报错
                elem.data = val
            } catch (e) {}
        } else {
            //绑定在特性节点上
            elem.textContent = val
        }
    }
})
function parseDisplay(nodeName, val) {
    //用于取得此类标签的默认display值
    var key = '_' + nodeName
    if (!parseDisplay[key]) {
        var node = DOC.createElement(nodeName)
        root.appendChild(node)
        if (W3C) {
            val = getComputedStyle(node, null).display
        } else {
            val = node.currentStyle.display
        }
        root.removeChild(node)
        parseDisplay[key] = val
    }
    return parseDisplay[key]
}

yua.parseDisplay = parseDisplay

yua.directive('visible', {
    init: function(binding) {
        effectBinding(binding.element, binding)
    },
    update: function(val) {
        var binding = this,
            elem = this.element,
            stamp
        var noEffect = !this.effectName
        if (!this.stamp) {
            stamp = this.stamp = +new Date()
            if (val) {
                elem.style.display = binding.display || ''
                if (yua(elem).css('display') === 'none') {
                    elem.style.display = binding.display = parseDisplay(
                        elem.nodeName
                    )
                }
            } else {
                elem.style.display = 'none'
            }
            return
        }
        stamp = this.stamp = +new Date()
        if (val) {
            yua.effect.apply(elem, 1, function() {
                if (stamp !== binding.stamp) return
                var driver = elem.getAttribute('data-effect-driver') || 'a'

                if (noEffect) {
                    //不用动画时走这里
                    elem.style.display = binding.display || ''
                }
                // "a", "t"
                if (driver === 'a' || driver === 't') {
                    if (yua(elem).css('display') === 'none') {
                        elem.style.display =
                            binding.display || parseDisplay(elem.nodeName)
                    }
                }
            })
        } else {
            yua.effect.apply(elem, 0, function() {
                if (stamp !== binding.stamp) return
                elem.style.display = 'none'
            })
        }
    }
})

/*********************************************************************
 *                             自带过滤器                             *
 **********************************************************************/

var rscripts = /<script[^>]*>([\S\s]*?)<\/script\s*>/gim
var ron = /\s+(on[^=\s]+)(?:=("[^"]*"|'[^']*'|[^\s>]+))?/g
var ropen = /<\w+\b(?:(["'])[^"]*?(\1)|[^>])*>/gi
var rsanitize = {
    a: /\b(href)\=("javascript[^"]*"|'javascript[^']*')/gi,
    img: /\b(src)\=("javascript[^"]*"|'javascript[^']*')/gi,
    form: /\b(action)\=("javascript[^"]*"|'javascript[^']*')/gi
}
var rsurrogate = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g
var rnoalphanumeric = /([^\#-~| |!])/g

function numberFormat(number, decimals, point, thousands) {
    //form http://phpjs.org/functions/number_format/
    //number 必需，要格式化的数字
    //decimals 可选，规定多少个小数位。
    //point 可选，规定用作小数点的字符串（默认为 . ）。
    //thousands 可选，规定用作千位分隔符的字符串（默认为 , ），如果设置了该参数，那么所有其他参数都是必需的。
    number = (number + '').replace(/[^0-9+\-Ee.]/g, '')
    var n = !isFinite(+number) ? 0 : +number,
        prec = !isFinite(+decimals) ? 3 : Math.abs(decimals),
        sep = thousands || ',',
        dec = point || '.',
        s = '',
        toFixedFix = function(n, prec) {
            var k = Math.pow(10, prec)
            return '' + (Math.round(n * k) / k).toFixed(prec)
        }
    // Fix for IE parseFloat(0.55).toFixed(0) = 0;
    s = (prec ? toFixedFix(n, prec) : '' + Math.round(n)).split('.')
    if (s[0].length > 3) {
        s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g, sep)
    }
    if ((s[1] || '').length < prec) {
        s[1] = s[1] || ''
        s[1] += new Array(prec - s[1].length + 1).join('0')
    }
    return s.join(dec)
}

var filters = (yua.filters = {
    uppercase: function(str) {
        return str.toUpperCase()
    },
    lowercase: function(str) {
        return str.toLowerCase()
    },
    //字符串截取，超过指定长度以mark标识接上
    truncate: function(str, len, mark) {
        len = len || 30
        mark = typeof mark === 'string' ? mark : '...'
        return str.slice(0, len) + (str.length <= len ? '' : mark)
    },
    //小值秒数转化为 时间格式
    time: function(str) {
        str = str >> 0
        var s = str % 60
        ;(m = Math.floor(str / 60)), (h = Math.floor(m / 60)), (m = m % 60)
        m = m < 10 ? '0' + m : m
        s = s < 10 ? '0' + s : s

        if (h > 0) {
            h = h < 10 ? '0' + h : h
            return h + ':' + m + ':' + s
        }
        return m + ':' + s
    },
    $filter: function(val) {
        for (var i = 1, n = arguments.length; i < n; i++) {
            var array = arguments[i]
            var fn = yua.filters[array[0]]
            if (typeof fn === 'function') {
                var arr = [val].concat(array.slice(1))
                val = fn.apply(null, arr)
            }
        }
        return val
    },
    camelize: camelize,
    //https://www.owasp.org/index.php/XSS_Filter_Evasion_Cheat_Sheet
    //    <a href="javasc&NewLine;ript&colon;alert('XSS')">chrome</a>
    //    <a href="data:text/html;base64, PGltZyBzcmM9eCBvbmVycm9yPWFsZXJ0KDEpPg==">chrome</a>
    //    <a href="jav  ascript:alert('XSS');">IE67chrome</a>
    //    <a href="jav&#x09;ascript:alert('XSS');">IE67chrome</a>
    //    <a href="jav&#x0A;ascript:alert('XSS');">IE67chrome</a>
    sanitize: function(str) {
        return str.replace(rscripts, '').replace(ropen, function(a, b) {
            var match = a.toLowerCase().match(/<(\w+)\s/)
            if (match) {
                //处理a标签的href属性，img标签的src属性，form标签的action属性
                var reg = rsanitize[match[1]]
                if (reg) {
                    a = a.replace(reg, function(s, name, value) {
                        var quote = value.charAt(0)
                        return name + '=' + quote + 'javascript:void(0)' + quote // jshint ignore:line
                    })
                }
            }
            return a.replace(ron, ' ').replace(/\s+/g, ' ') //移除onXXX事件
        })
    },
    escape: function(str) {
        //将字符串经过 str 转义得到适合在页面中显示的内容, 例如替换 < 为 &lt
        return String(str)
            .replace(/&/g, '&amp;')
            .replace(rsurrogate, function(value) {
                var hi = value.charCodeAt(0)
                var low = value.charCodeAt(1)
                return (
                    '&#' +
                    ((hi - 0xd800) * 0x400 + (low - 0xdc00) + 0x10000) +
                    ';'
                )
            })
            .replace(rnoalphanumeric, function(value) {
                return '&#' + value.charCodeAt(0) + ';'
            })
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
    },
    currency: function(amount, symbol, fractionSize) {
        return (
            (symbol || '\u00a5') +
            numberFormat(amount, isFinite(fractionSize) ? fractionSize : 2)
        )
    },
    number: numberFormat,
    //日期格式化，类似php的date函数，
    date: function(stamp, str, second) {
        second = second === undefined ? false : true
        var oDate
        if (!Date.isDate(stamp)) {
            if (!/[^\d]/.test(stamp)) {
                stamp -= 0
                if (second) {
                    stamp *= 1000
                }
            }

            oDate = new Date(stamp)
            if (oDate + '' === 'Invalid Date') return 'Invalid Date'
        } else {
            oDate = stamp
        }
        return oDate.format(str)
    }
})

/*********************************************************************
 *                      AMD加载器                                     *
 **********************************************************************/

//https://www.devbridge.com/articles/understanding-amd-requirejs/
//http://maxogden.com/nested-dependencies.html
var modules = (yua.modules = {
    'domReady!': {
        exports: yua,
        state: 3
    },
    yua: {
        exports: yua,
        state: 4
    }
})
//Object(modules[id]).state拥有如下值
// undefined  没有定义
// 1(send)    已经发出请求
// 2(loading) 已经被执行但还没有执行完成，在这个阶段define方法会被执行
// 3(loaded)  执行完毕，通过onload/onreadystatechange回调判定，在这个阶段checkDeps方法会执行
// 4(execute)  其依赖也执行完毕, 值放到exports对象上，在这个阶段fireFactory方法会执行
modules.exports = modules.yua
var otherRequire = window.require
var otherDefine = window.define
var innerRequire
plugins.loader = function(builtin) {
    var flag = innerRequire && builtin
    window.require = flag ? innerRequire : otherRequire
    window.define = flag ? innerRequire.define : otherDefine
}
new function() {
    // jshint ignore:line
    var loadings = [] //正在加载中的模块列表
    var factorys = [] //放置define方法的factory函数
    var rjsext = /\.js$/i
    function makeRequest(name, config) {
        //1. 去掉资源前缀
        var res = 'js'
        name = name.replace(/^(\w+)\!/, function(a, b) {
            res = b
            return ''
        })
        if (res === 'ready') {
            log('ready!已经被废弃，请使用domReady!')
            res = 'domReady'
        }
        //2. 去掉querystring, hash
        var query = ''
        name = name.replace(rquery, function(a) {
            query = a
            return ''
        })
        //3. 去掉扩展名
        var suffix = '.' + res
        var ext = /js|css/.test(suffix) ? suffix : ''
        name = name.replace(/\.[a-z0-9]+$/g, function(a) {
            if (a === suffix) {
                ext = a
                return ''
            } else {
                return a
            }
        })
        //补上协议, 避免引入依赖时判断不正确
        if (/^\/\//.test(name)) {
            name = location.protocol + name
        }
        var req = yua.mix(
            {
                query: query,
                ext: ext,
                res: res,
                name: name,
                toUrl: toUrl
            },
            config
        )
        req.toUrl(name)
        return req
    }

    function fireRequest(req) {
        var name = req.name
        var res = req.res
        //1. 如果该模块已经发出请求，直接返回
        var module = modules[name]
        var urlNoQuery = name && req.urlNoQuery
        if (module && module.state >= 1) {
            return name
        }
        module = modules[urlNoQuery]
        if (module && module.state >= 3) {
            innerRequire(module.deps || [], module.factory, urlNoQuery)
            return urlNoQuery
        }
        if (name && !module) {
            module = modules[urlNoQuery] = {
                id: urlNoQuery,
                state: 1 //send
            }
            var wrap = function(obj) {
                resources[res] = obj
                obj.load(name, req, function(a) {
                    if (arguments.length && a !== void 0) {
                        module.exports = a
                    }
                    module.state = 4
                    checkDeps()
                })
            }

            if (!resources[res]) {
                innerRequire([res], wrap)
            } else {
                wrap(resources[res])
            }
        }
        return name ? urlNoQuery : res + '!'
    }

    //核心API之一 require
    var requireQueue = []
    var isUserFirstRequire = false
    innerRequire = yua.require = function(
        array,
        factory,
        parentUrl,
        defineConfig
    ) {
        if (!isUserFirstRequire) {
            requireQueue.push(yua.slice(arguments))
            if (arguments.length <= 2) {
                isUserFirstRequire = true
                var queue = requireQueue.splice(0, requireQueue.length),
                    args
                while ((args = queue.shift())) {
                    innerRequire.apply(null, args)
                }
            }
            return
        }
        if (!Array.isArray(array)) {
            yua.error('require方法的第一个参数应为数组 ' + array)
        }
        var deps = [] // 放置所有依赖项的完整路径
        var uniq = createMap()
        var id = parentUrl || 'callback' + setTimeout('1') // jshint ignore:line
        defineConfig = defineConfig || createMap()
        defineConfig.baseUrl = kernel.baseUrl
        var isBuilt = !!defineConfig.built
        if (parentUrl) {
            defineConfig.parentUrl = parentUrl.substr(
                0,
                parentUrl.lastIndexOf('/')
            )
            defineConfig.mapUrl = parentUrl.replace(rjsext, '')
        }
        if (isBuilt) {
            var req = makeRequest(defineConfig.defineName, defineConfig)
            id = req.urlNoQuery
        } else {
            array.forEach(function(name) {
                if (!name) {
                    return
                }
                var req = makeRequest(name, defineConfig)
                var url = fireRequest(req) //加载资源，并返回该资源的完整地址

                if (url) {
                    if (!uniq[url]) {
                        deps.push(url)
                        uniq[url] = !0
                    }
                }
            })
        }

        var module = modules[id]
        if (!module || module.state !== 4) {
            modules[id] = {
                id: id,
                deps: isBuilt ? array.concat() : deps,
                factory: factory || noop,
                state: 3
            }
        }
        if (!module) {
            //如果此模块是定义在另一个JS文件中, 那必须等该文件加载完毕, 才能放到检测列队中
            loadings.push(id)
        }
        checkDeps()
    }

    //核心API之二 require
    innerRequire.define = function(name, deps, factory) {
        //模块名,依赖列表,模块本身
        if (typeof name !== 'string') {
            factory = deps
            deps = name
            name = 'anonymous'
        }
        if (!Array.isArray(deps)) {
            factory = deps
            deps = []
        }
        var config = {
            built: !isUserFirstRequire, //用r.js打包后,所有define会放到requirejs之前
            defineName: name
        }
        var args = [deps, factory, config]
        factory.require = function(url) {
            args.splice(2, 0, url)
            if (modules[url]) {
                modules[url].state = 3 //loaded
                var isCycle = false
                try {
                    isCycle = checkCycle(modules[url].deps, url)
                } catch (e) {}
                if (isCycle) {
                    yua.error(
                        url +
                            '模块与之前的模块存在循环依赖，请不要直接用script标签引入' +
                            url +
                            '模块'
                    )
                }
            }
            delete factory.require //释放内存
            innerRequire.apply(null, args) //0,1,2 --> 1,2,0
        }
        //根据标准,所有遵循W3C标准的浏览器,script标签会按标签的出现顺序执行。
        //老的浏览器中，加载也是按顺序的：一个文件下载完成后，才开始下载下一个文件。
        //较新的浏览器中（IE8+ 、FireFox3.5+ 、Chrome4+ 、Safari4+），为了减小请求时间以优化体验，
        //下载可以是并行的，但是执行顺序还是按照标签出现的顺序。
        //但如果script标签是动态插入的, 就未必按照先请求先执行的原则了,目测只有firefox遵守
        //唯一比较一致的是,IE10+及其他标准浏览器,一旦开始解析脚本, 就会一直堵在那里,直接脚本解析完毕
        //亦即，先进入loading阶段的script标签(模块)必然会先进入loaded阶段
        var url = config.built ? 'unknown' : getCurrentScript()
        if (url) {
            var module = modules[url]
            if (module) {
                module.state = 2
            }
            factory.require(url)
        } else {
            //合并前后的safari，合并后的IE6-9走此分支
            factorys.push(factory)
        }
    }
    //核心API之三 require.config(settings)
    innerRequire.config = kernel
    //核心API之四 define.amd 标识其符合AMD规范
    innerRequire.define.amd = modules

    //==========================对用户配置项进行再加工==========================
    var allpaths = (kernel['orig.paths'] = createMap())
    var allmaps = (kernel['orig.map'] = createMap())
    var allpackages = (kernel['packages'] = [])
    var allargs = (kernel['orig.args'] = createMap())
    yua.mix(plugins, {
        paths: function(hash) {
            yua.mix(allpaths, hash)
            kernel.paths = makeIndexArray(allpaths)
        },
        map: function(hash) {
            yua.mix(allmaps, hash)
            var list = makeIndexArray(allmaps, 1, 1)
            yua.each(list, function(_, item) {
                item.val = makeIndexArray(item.val)
            })
            kernel.map = list
        },
        packages: function(array) {
            array = array.concat(allpackages)
            var uniq = createMap()
            var ret = []
            for (var i = 0, pkg; (pkg = array[i++]); ) {
                pkg = typeof pkg === 'string' ? { name: pkg } : pkg
                var name = pkg.name
                if (!uniq[name]) {
                    var url = joinPath(pkg.location || name, pkg.main || 'main')
                    url = url.replace(rjsext, '')
                    ret.push(pkg)
                    uniq[name] = pkg.location = url
                    pkg.reg = makeMatcher(name)
                }
            }
            kernel.packages = ret.sort()
        },
        urlArgs: function(hash) {
            if (typeof hash === 'string') {
                hash = { '*': hash }
            }
            yua.mix(allargs, hash)
            kernel.urlArgs = makeIndexArray(allargs, 1)
        },
        baseUrl: function(url) {
            if (!isAbsUrl(url)) {
                var baseElement = head.getElementsByTagName('base')[0]
                if (baseElement) {
                    head.removeChild(baseElement)
                }
                var node = DOC.createElement('a')
                node.href = url
                url = node.href
                if (baseElement) {
                    head.insertBefore(baseElement, head.firstChild)
                }
            }
            if (url.length > 3) kernel.baseUrl = url
        },
        shim: function(obj) {
            for (var i in obj) {
                var value = obj[i]
                if (Array.isArray(value)) {
                    value = obj[i] = {
                        deps: value
                    }
                }
                if (!value.exportsFn && (value.exports || value.init)) {
                    value.exportsFn = makeExports(value)
                }
            }
            kernel.shim = obj
        }
    })

    //==============================内部方法=================================
    function checkCycle(deps, nick) {
        //检测是否存在循环依赖
        for (var i = 0, id; (id = deps[i++]); ) {
            if (
                modules[id].state !== 4 &&
                (id === nick || checkCycle(modules[id].deps, nick))
            ) {
                return true
            }
        }
    }

    function checkFail(node, onError) {
        var id = trimQuery(node.src) //检测是否死链
        node.onload = node.onerror = null
        if (onError) {
            setTimeout(function() {
                head.removeChild(node)
                node = null // 处理旧式IE下的循环引用问题
            })
            log('加载 ' + id + ' 失败')
        } else {
            return true
        }
    }

    function checkDeps() {
        //检测此JS模块的依赖是否都已安装完毕,是则安装自身
        loop: for (var i = loadings.length, id; (id = loadings[--i]); ) {
            var obj = modules[id],
                deps = obj.deps
            if (!deps) continue
            for (var j = 0, key; (key = deps[j]); j++) {
                if (Object(modules[key]).state !== 4) {
                    continue loop
                }
            }
            //如果deps是空对象或者其依赖的模块的状态都是4
            if (obj.state !== 4) {
                loadings.splice(i, 1) //必须先移除再安装，防止在IE下DOM树建完后手动刷新页面，会多次执行它
                fireFactory(obj.id, obj.deps, obj.factory)
                checkDeps() //如果成功,则再执行一次,以防有些模块就差本模块没有安装好
            }
        }
    }

    function loadJS(url, id, callback) {
        //通过script节点加载目标模块
        var node = DOC.createElement('script')
        node.className = subscribers //让getCurrentScript只处理类名为subscribers的script节点
        node.onload = function() {
            var factory = factorys.pop()
            factory && factory.require(id)
            if (callback) {
                callback()
            }
            id && loadings.push(id)
            checkDeps()
        }
        node.onerror = function() {
            checkFail(node, true)
        }

        head.insertBefore(node, head.firstChild) //chrome下第二个参数不能为null
        node.src = url //插入到head的第一个节点前，防止IE6下head标签没闭合前使用appendChild抛错,更重要的是IE6下可以收窄getCurrentScript的寻找范围
    }

    var resources = (innerRequire.plugins = {
        //三大常用资源插件 js!, css!, text!, domReady!
        domReady: {
            load: noop
        },
        js: {
            load: function(name, req, onLoad) {
                var url = req.url
                var id = req.urlNoQuery
                var shim = kernel.shim[name.replace(rjsext, '')]
                if (shim) {
                    //shim机制
                    innerRequire(shim.deps || [], function() {
                        var args = yua.slice(arguments)
                        loadJS(url, id, function() {
                            onLoad(
                                shim.exportsFn
                                    ? shim.exportsFn.apply(0, args)
                                    : void 0
                            )
                        })
                    })
                } else {
                    loadJS(url, id)
                }
            }
        },
        css: {
            load: function(name, req, onLoad) {
                var url = req.url
                head.insertAdjacentHTML(
                    'afterBegin',
                    '<link rel="stylesheet" href="' + url + '">'
                )
                onLoad()
            }
        },
        text: {
            load: function(name, req, onLoad) {
                var xhr = getXHR()
                xhr.onload = function() {
                    var status = xhr.status
                    if (status > 399 && status < 600) {
                        yua.error(url + ' 对应资源不存在或没有开启 CORS')
                    } else {
                        onLoad(xhr.responseText)
                    }
                }
                xhr.open('GET', req.url, true)
                xhr.send()
            }
        }
    })
    innerRequire.checkDeps = checkDeps

    var rquery = /(\?[^#]*)$/
    function trimQuery(url) {
        return (url || '').replace(rquery, '')
    }

    function isAbsUrl(path) {
        //http://stackoverflow.com/questions/10687099/how-to-test-if-a-url-string-is-absolute-or-relative
        return /^(?:[a-z\-]+:)?\/\//i.test(String(path))
    }

    function getCurrentScript() {
        // inspireb by https://github.com/samyk/jiagra/blob/master/jiagra.js
        var stack
        try {
            a.b.c() //强制报错,以便捕获e.stack
        } catch (e) {
            //safari5的sourceURL，firefox的fileName，它们的效果与e.stack不一样
            stack = e.stack
        }
        if (stack) {
            /**e.stack最后一行在所有支持的浏览器大致如下:
             *chrome23:
             * at http://113.93.50.63/data.js:4:1
             *firefox17:
             *@http://113.93.50.63/query.js:4
             *opera12:http://www.oldapps.com/opera.php?system=Windows_XP
             *@http://113.93.50.63/data.js:4
             *IE10:
             *  at Global code (http://113.93.50.63/data.js:4:1)
             *  //firefox4+ 可以用document.currentScript
             */
            stack = stack.split(/[@ ]/g).pop() //取得最后一行,最后一个空格或@之后的部分
            stack =
                stack[0] === '(' ? stack.slice(1, -1) : stack.replace(/\s/, '') //去掉换行符
            return trimQuery(stack.replace(/(:\d+)?:\d+$/i, '')) //去掉行号与或许存在的出错字符起始位置
        }
        var nodes = head.getElementsByTagName('script') //只在head标签中寻找
        for (var i = nodes.length, node; (node = nodes[--i]); ) {
            if (
                node.className === subscribers &&
                node.readyState === 'interactive'
            ) {
                var url = node.src
                return (node.className = trimQuery(url))
            }
        }
    }

    var rcallback = /^callback\d+$/
    function fireFactory(id, deps, factory) {
        var module = Object(modules[id])
        module.state = 4
        for (var i = 0, array = [], d; (d = deps[i++]); ) {
            if (d === 'exports') {
                var obj = module.exports || (module.exports = createMap())
                array.push(obj)
            } else {
                array.push(modules[d].exports)
            }
        }
        try {
            var ret = factory.apply(window, array)
        } catch (e) {
            log('执行[' + id + ']模块的factory抛错： ', e)
        }
        if (ret !== void 0) {
            module.exports = ret
        }
        if (rcallback.test(id)) {
            delete modules[id]
        }
        delete module.factory
        return ret
    }
    function toUrl(id) {
        if (id.indexOf(this.res + '!') === 0) {
            id = id.slice(this.res.length + 1) //处理define("css!style",[], function(){})的情况
        }
        var url = id
        //1. 是否命中paths配置项
        var usePath = 0
        var baseUrl = this.baseUrl
        var rootUrl = this.parentUrl || baseUrl
        eachIndexArray(id, kernel.paths, function(value, key) {
            url = url.replace(key, value)
            usePath = 1
        })
        //2. 是否命中packages配置项
        if (!usePath) {
            eachIndexArray(id, kernel.packages, function(value, key, item) {
                url = url.replace(item.name, item.location)
            })
        }
        //3. 是否命中map配置项
        if (this.mapUrl) {
            eachIndexArray(this.mapUrl, kernel.map, function(array) {
                eachIndexArray(url, array, function(mdValue, mdKey) {
                    url = url.replace(mdKey, mdValue)
                    rootUrl = baseUrl
                })
            })
        }
        var ext = this.ext
        if (ext && usePath && url.slice(-ext.length) === ext) {
            url = url.slice(0, -ext.length)
        }
        //4. 转换为绝对路径
        if (!isAbsUrl(url)) {
            rootUrl = this.built || /^\w/.test(url) ? baseUrl : rootUrl
            url = joinPath(rootUrl, url)
        }
        //5. 还原扩展名，query
        var urlNoQuery = url + ext
        url = urlNoQuery + this.query
        urlNoQuery = url.replace(rquery, function(a) {
            this.query = a
            return ''
        })
        //6. 处理urlArgs
        eachIndexArray(id, kernel.urlArgs, function(value) {
            url += (url.indexOf('?') === -1 ? '?' : '&') + value
        })
        this.url = url
        return (this.urlNoQuery = urlNoQuery)
    }

    function makeIndexArray(hash, useStar, part) {
        //创建一个经过特殊算法排好序的数组
        var index = hash2array(hash, useStar, part)
        index.sort(descSorterByName)
        return index
    }

    function makeMatcher(prefix) {
        return new RegExp('^' + prefix + '(/|$)')
    }

    function makeExports(value) {
        return function() {
            var ret
            if (value.init) {
                ret = value.init.apply(window, arguments)
            }
            return ret || (value.exports && getGlobal(value.exports))
        }
    }

    function hash2array(hash, useStar, part) {
        var array = []
        for (var key in hash) {
            // if (hash.hasOwnProperty(key)) {//hash是由createMap创建没有hasOwnProperty
            var item = {
                name: key,
                val: hash[key]
            }
            array.push(item)
            item.reg = key === '*' && useStar ? /^/ : makeMatcher(key)
            if (part && key !== '*') {
                item.reg = new RegExp('/' + key.replace(/^\//, '') + '(/|$)')
            }
            //   }
        }
        return array
    }

    function eachIndexArray(moduleID, array, matcher) {
        array = array || []
        for (var i = 0, el; (el = array[i++]); ) {
            if (el.reg.test(moduleID)) {
                matcher(el.val, el.name, el)
                return false
            }
        }
    }
    // 根据元素的name项进行数组字符数逆序的排序函数
    function descSorterByName(a, b) {
        var aaa = a.name
        var bbb = b.name
        if (bbb === '*') {
            return -1
        }
        if (aaa === '*') {
            return 1
        }
        return bbb.length - aaa.length
    }

    var rdeuce = /\/\w+\/\.\./
    function joinPath(a, b) {
        if (a.charAt(a.length - 1) !== '/') {
            a += '/'
        }
        if (b.slice(0, 2) === './') {
            //相对于兄弟路径
            return a + b.slice(2)
        }
        if (b.slice(0, 2) === '..') {
            //相对于父路径
            a += b
            while (rdeuce.test(a)) {
                a = a.replace(rdeuce, '')
            }
            return a
        }
        if (b.slice(0, 1) === '/') {
            return a + b.slice(1)
        }
        return a + b
    }

    function getGlobal(value) {
        if (!value) {
            return value
        }
        var g = window
        value.split('.').forEach(function(part) {
            g = g[part]
        })
        return g
    }

    var mainNode = DOC.scripts[DOC.scripts.length - 1]
    var dataMain = mainNode.getAttribute('data-main')
    if (dataMain) {
        plugins.baseUrl(dataMain)
        var href = kernel.baseUrl
        kernel.baseUrl = href.slice(0, href.lastIndexOf('/') + 1)
        loadJS(href.replace(rjsext, '') + '.js')
    } else {
        var loaderUrl = trimQuery(mainNode.src)
        kernel.baseUrl = loaderUrl.slice(0, loaderUrl.lastIndexOf('/') + 1)
    }
}() // jshint ignore:line

var ua = navigator.userAgent.toLowerCase()
//http://stackoverflow.com/questions/9038625/detect-if-device-is-ios
function iOSversion() {
    //https://developer.apple.com/library/prerelease/mac/releasenotes/General/WhatsNewInSafari/Articles/Safari_9.html
    //http://mp.weixin.qq.com/s?__biz=MzA3MDQ4MzQzMg==&mid=256900619&idx=1&sn=b29f84cff0b8d7b9742e5d8b3cd8f218&scene=1&srcid=1009F9l4gh9nZ7rcQJEhmf7Q#rd
    if (/iPad|iPhone|iPod/i.test(ua) && !window.MSStream) {
        if ('backdropFilter' in document.documentElement.style) {
            return 9
        }
        if (!!window.indexedDB) {
            return 8
        }
        if (!!window.SpeechSynthesisUtterance) {
            return 7
        }
        if (!!window.webkitAudioContext) {
            return 6
        }
        if (!!window.matchMedia) {
            return 5
        }
        if (!!window.history && 'pushState' in window.history) {
            return 4
        }
        return 3
    }
    return NaN
}

var deviceIsAndroid = ua.indexOf('android') > 0
var deviceIsIOS = iOSversion()

var Recognizer = (yua.gestureHooks = {
    pointers: {},
    //以AOP切入touchstart, touchmove, touchend, touchcancel回调
    start: function(event, callback) {
        //touches是当前屏幕上所有触摸点的列表;
        //targetTouches是当前对象上所有触摸点的列表;
        //changedTouches是涉及当前事件的触摸点的列表。
        for (var i = 0; i < event.changedTouches.length; i++) {
            var touch = event.changedTouches[i],
                id = touch.identifier,
                pointer = {
                    startTouch: mixLocations({}, touch),
                    startTime: Date.now(),
                    status: 'tapping',
                    element: event.target,
                    pressingHandler:
                        Recognizer.pointers[id] &&
                        Recognizer.pointers[id].pressingHandler
                }
            Recognizer.pointers[id] = pointer
            callback(pointer, touch)
        }
    },
    move: function(event, callback) {
        for (var i = 0; i < event.changedTouches.length; i++) {
            var touch = event.changedTouches[i]
            var pointer = Recognizer.pointers[touch.identifier]
            if (!pointer) {
                return
            }

            if (!('lastTouch' in pointer)) {
                pointer.lastTouch = pointer.startTouch
                pointer.lastTime = pointer.startTime
                pointer.deltaX = pointer.deltaY = pointer.duration = pointer.distance = 0
            }

            var time = Date.now() - pointer.lastTime

            if (time > 0) {
                var RECORD_DURATION = 70
                if (time > RECORD_DURATION) {
                    time = RECORD_DURATION
                }
                if (pointer.duration + time > RECORD_DURATION) {
                    pointer.duration = RECORD_DURATION - time
                }

                pointer.duration += time
                pointer.lastTouch = mixLocations({}, touch)

                pointer.lastTime = Date.now()

                pointer.deltaX = touch.clientX - pointer.startTouch.clientX
                pointer.deltaY = touch.clientY - pointer.startTouch.clientY
                var x = pointer.deltaX * pointer.deltaX
                var y = pointer.deltaY * pointer.deltaY
                pointer.distance = Math.sqrt(x + y)
                pointer.isVertical = x < y

                callback(pointer, touch)
            }
        }
    },
    end: function(event, callback) {
        for (var i = 0; i < event.changedTouches.length; i++) {
            var touch = event.changedTouches[i],
                id = touch.identifier,
                pointer = Recognizer.pointers[id]

            if (!pointer) continue

            callback(pointer, touch)

            delete Recognizer.pointers[id]
        }
    },
    //人工触发合成事件
    fire: function(elem, type, props) {
        if (elem) {
            var event = document.createEvent('Events')
            event.initEvent(type, true, true)
            yua.mix(event, props)
            elem.dispatchEvent(event)
        }
    },
    //添加各种识别器
    add: function(name, recognizer) {
        function move(event) {
            recognizer.touchmove(event)
        }

        function end(event) {
            recognizer.touchend(event)

            document.removeEventListener('touchmove', move)

            document.removeEventListener('touchend', end)

            document.removeEventListener('touchcancel', cancel)
        }

        function cancel(event) {
            recognizer.touchcancel(event)

            document.removeEventListener('touchmove', move)

            document.removeEventListener('touchend', end)

            document.removeEventListener('touchcancel', cancel)
        }

        recognizer.events.forEach(function(eventName) {
            yua.eventHooks[eventName] = {
                fix: function(el, fn) {
                    if (!el['touch-' + name]) {
                        el['touch-' + name] = '1'
                        el.addEventListener('touchstart', function(event) {
                            recognizer.touchstart(event)

                            document.addEventListener('touchmove', move)

                            document.addEventListener('touchend', end)

                            document.addEventListener('touchcancel', cancel)
                        })
                    }
                    return fn
                }
            }
        })
    }
})

var locations = ['screenX', 'screenY', 'clientX', 'clientY', 'pageX', 'pageY']

// 复制 touch 对象上的有用属性到固定对象上
function mixLocations(target, source) {
    if (source) {
        locations.forEach(function(key) {
            target[key] = source[key]
        })
    }
    return target
}

var supportPointer = !!navigator.pointerEnabled || !!navigator.msPointerEnabled

if (supportPointer) {
    // 支持pointer的设备可用样式来取消click事件的300毫秒延迟
    root.style.msTouchAction = root.style.touchAction = 'none'
}
var tapRecognizer = {
    events: ['tap'],
    touchBoundary: 10,
    tapDelay: 200,
    needClick: function(target) {
        //判定是否使用原生的点击事件, 否则使用sendClick方法手动触发一个人工的点击事件
        switch (target.nodeName.toLowerCase()) {
            case 'button':
            case 'select':
            case 'textarea':
                if (target.disabled) {
                    return true
                }

                break
            case 'input':
                // IOS6 pad 上选择文件，如果不是原生的click，弹出的选择界面尺寸错误
                if (
                    (deviceIsIOS && target.type === 'file') ||
                    target.disabled
                ) {
                    return true
                }

                break
            case 'label':
            case 'iframe':
            case 'video':
                return true
        }

        return false
    },
    needFocus: function(target) {
        switch (target.nodeName.toLowerCase()) {
            case 'textarea':
            case 'select': //实测android下select也需要
                return true
            case 'input':
                switch (target.type) {
                    case 'button':
                    case 'checkbox':
                    case 'file':
                    case 'image':
                    case 'radio':
                    case 'submit':
                        return false
                }
                //如果是只读或disabled状态,就无须获得焦点了
                return !target.disabled && !target.readOnly
            default:
                return false
        }
    },
    focus: function(targetElement) {
        var length
        //在iOS7下, 对一些新表单元素(如date, datetime, time, month)调用focus方法会抛错,
        //幸好的是,我们可以改用setSelectionRange获取焦点, 将光标挪到文字的最后
        var type = targetElement.type
        if (
            deviceIsIOS &&
            targetElement.setSelectionRange &&
            type.indexOf('date') !== 0 &&
            type !== 'time' &&
            type !== 'month'
        ) {
            length = targetElement.value.length
            targetElement.setSelectionRange(length, length)
        } else {
            targetElement.focus()
        }
    },
    findControl: function(labelElement) {
        // 获取label元素所对应的表单元素
        // 可以能过control属性, getElementById, 或用querySelector直接找其内部第一表单元素实现
        if (labelElement.control !== undefined) {
            return labelElement.control
        }

        if (labelElement.htmlFor) {
            return document.getElementById(labelElement.htmlFor)
        }

        return labelElement.querySelector(
            'button, input:not([type=hidden]), keygen, meter, output, progress, select, textarea'
        )
    },
    fixTarget: function(target) {
        if (target.nodeType === 3) {
            return target.parentNode
        }
        if (window.SVGElementInstance && target instanceof SVGElementInstance) {
            return target.correspondingUseElement
        }

        return target
    },
    updateScrollParent: function(targetElement) {
        //如果事件源元素位于某一个有滚动条的祖父元素中,那么保持其scrollParent与scrollTop值
        var scrollParent = targetElement.tapScrollParent

        if (!scrollParent || !scrollParent.contains(targetElement)) {
            var parentElement = targetElement
            do {
                if (parentElement.scrollHeight > parentElement.offsetHeight) {
                    scrollParent = parentElement
                    targetElement.tapScrollParent = parentElement
                    break
                }

                parentElement = parentElement.parentElement
            } while (parentElement)
        }

        if (scrollParent) {
            scrollParent.lastScrollTop = scrollParent.scrollTop
        }
    },
    touchHasMoved: function(event) {
        //判定是否发生移动,其阀值是10px
        var touch = event.changedTouches[0],
            boundary = tapRecognizer.touchBoundary
        return (
            Math.abs(touch.pageX - tapRecognizer.pageX) > boundary ||
            Math.abs(touch.pageY - tapRecognizer.pageY) > boundary
        )
    },

    findType: function(targetElement) {
        // 安卓chrome浏览器上，模拟的 click 事件不能让 select 打开，故使用 mousedown 事件
        return deviceIsAndroid &&
            targetElement.tagName.toLowerCase() === 'select'
            ? 'mousedown'
            : 'click'
    },
    sendClick: function(targetElement, event) {
        // 在click之前触发tap事件
        Recognizer.fire(targetElement, 'tap', {
            touchEvent: event
        })
        var clickEvent, touch
        //某些安卓设备必须先移除焦点，之后模拟的click事件才能让新元素获取焦点
        if (
            document.activeElement &&
            document.activeElement !== targetElement
        ) {
            document.activeElement.blur()
        }

        touch = event.changedTouches[0]
        // 手动触发点击事件,此时必须使用document.createEvent('MouseEvents')来创建事件
        // 及使用initMouseEvent来初始化它
        clickEvent = document.createEvent('MouseEvents')
        clickEvent.initMouseEvent(
            tapRecognizer.findType(targetElement),
            true,
            true,
            window,
            1,
            touch.screenX,
            touch.screenY,
            touch.clientX,
            touch.clientY,
            false,
            false,
            false,
            false,
            0,
            null
        )
        clickEvent.touchEvent = event
        targetElement.dispatchEvent(clickEvent)
    },
    touchstart: function(event) {
        //忽略多点触摸
        if (event.targetTouches.length !== 1) {
            return true
        }
        //修正事件源对象
        var targetElement = tapRecognizer.fixTarget(event.target)
        var touch = event.targetTouches[0]
        if (deviceIsIOS) {
            // 判断是否是点击文字，进行选择等操作，如果是，不需要模拟click
            var selection = window.getSelection()
            if (selection.rangeCount && !selection.isCollapsed) {
                return true
            }
            var id = touch.identifier
            //当 alert 或 confirm 时，点击其他地方，会触发touch事件，identifier相同，此事件应该被忽略
            if (
                id &&
                isFinite(tapRecognizer.lastTouchIdentifier) &&
                tapRecognizer.lastTouchIdentifier === id
            ) {
                event.preventDefault()
                return false
            }

            tapRecognizer.lastTouchIdentifier = id

            tapRecognizer.updateScrollParent(targetElement)
        }
        //收集触摸点的信息
        tapRecognizer.status = 'tapping'
        tapRecognizer.startTime = Date.now()
        tapRecognizer.element = targetElement
        tapRecognizer.pageX = touch.pageX
        tapRecognizer.pageY = touch.pageY
        // 如果点击太快,阻止双击带来的放大收缩行为
        if (
            tapRecognizer.startTime - tapRecognizer.lastTime <
            tapRecognizer.tapDelay
        ) {
            event.preventDefault()
        }
    },
    touchmove: function(event) {
        if (tapRecognizer.status !== 'tapping') {
            return true
        }
        // 如果事件源元素发生改变,或者发生了移动,那么就取消触发点击事件
        if (
            tapRecognizer.element !== tapRecognizer.fixTarget(event.target) ||
            tapRecognizer.touchHasMoved(event)
        ) {
            tapRecognizer.status = tapRecognizer.element = 0
        }
    },
    touchend: function(event) {
        var targetElement = tapRecognizer.element
        var now = Date.now()
        //如果是touchstart与touchend相隔太久,可以认为是长按,那么就直接返回
        //或者是在touchstart, touchmove阶段,判定其不该触发点击事件,也直接返回
        if (
            !targetElement ||
            now - tapRecognizer.startTime > tapRecognizer.tapDelay
        ) {
            return true
        }

        tapRecognizer.lastTime = now

        var startTime = tapRecognizer.startTime
        tapRecognizer.status = tapRecognizer.startTime = 0

        targetTagName = targetElement.tagName.toLowerCase()
        if (targetTagName === 'label') {
            //尝试触发label上可能绑定的tap事件
            Recognizer.fire(targetElement, 'tap', {
                touchEvent: event
            })
            var forElement = tapRecognizer.findControl(targetElement)
            if (forElement) {
                tapRecognizer.focus(targetElement)
                targetElement = forElement
            }
        } else if (tapRecognizer.needFocus(targetElement)) {
            //  如果元素从touchstart到touchend经历时间过长,那么不应该触发点击事
            //  或者此元素是iframe中的input元素,那么它也无法获点焦点
            if (
                now - startTime > 100 ||
                (deviceIsIOS &&
                    window.top !== window &&
                    targetTagName === 'input')
            ) {
                tapRecognizer.element = 0
                return false
            }

            tapRecognizer.focus(targetElement)
            deviceIsAndroid && tapRecognizer.sendClick(targetElement, event)

            return false
        }

        if (deviceIsIOS) {
            //如果它的父容器的滚动条发生改变,那么应该识别为划动或拖动事件,不应该触发点击事件
            var scrollParent = targetElement.tapScrollParent
            if (
                scrollParent &&
                scrollParent.lastScrollTop !== scrollParent.scrollTop
            ) {
                return true
            }
        }
        //如果这不是一个需要使用原生click的元素，则屏蔽原生事件，避免触发两次click
        if (!tapRecognizer.needClick(targetElement)) {
            event.preventDefault()
            // 触发一次模拟的click
            tapRecognizer.sendClick(targetElement, event)
        }
    },
    touchcancel: function() {
        tapRecognizer.startTime = tapRecognizer.element = 0
    }
}

Recognizer.add('tap', tapRecognizer)

var pressRecognizer = {
    events: ['longtap', 'doubletap'],
    cancelPress: function(pointer) {
        clearTimeout(pointer.pressingHandler)
        pointer.pressingHandler = null
    },
    touchstart: function(event) {
        Recognizer.start(event, function(pointer, touch) {
            pointer.pressingHandler = setTimeout(function() {
                if (pointer.status === 'tapping') {
                    Recognizer.fire(event.target, 'longtap', {
                        touch: touch,
                        touchEvent: event
                    })
                }
                pressRecognizer.cancelPress(pointer)
            }, 800)
            if (event.changedTouches.length !== 1) {
                pointer.status = 0
            }
        })
    },
    touchmove: function(event) {
        Recognizer.move(event, function(pointer) {
            if (pointer.distance > 10 && pointer.pressingHandler) {
                pressRecognizer.cancelPress(pointer)
                if (pointer.status === 'tapping') {
                    pointer.status = 'panning'
                }
            }
        })
    },
    touchend: function(event) {
        Recognizer.end(event, function(pointer, touch) {
            pressRecognizer.cancelPress(pointer)
            if (pointer.status === 'tapping') {
                pointer.lastTime = Date.now()
                if (
                    pressRecognizer.lastTap &&
                    pointer.lastTime - pressRecognizer.lastTap.lastTime < 300
                ) {
                    Recognizer.fire(pointer.element, 'doubletap', {
                        touch: touch,
                        touchEvent: event
                    })
                }

                pressRecognizer.lastTap = pointer
            }
        })
    },
    touchcancel: function(event) {
        Recognizer.end(event, function(pointer) {
            pressRecognizer.cancelPress(pointer)
        })
    }
}
Recognizer.add('press', pressRecognizer)

var swipeRecognizer = {
    events: ['swipe', 'swipeleft', 'swiperight', 'swipeup', 'swipedown'],
    getAngle: function(x, y) {
        return Math.atan2(y, x) * 180 / Math.PI
    },
    getDirection: function(x, y) {
        var angle = swipeRecognizer.getAngle(x, y)
        if (angle < -45 && angle > -135) {
            return 'up'
        } else if (angle >= 45 && angle < 315) {
            return 'down'
        } else if (angle > -45 && angle <= 45) {
            return 'right'
        } else {
            return 'left'
        }
    },
    touchstart: function(event) {
        Recognizer.start(event, noop)
    },
    touchmove: function(event) {
        Recognizer.move(event, noop)
    },
    touchend: function(event) {
        if (event.changedTouches.length !== 1) {
            return
        }
        Recognizer.end(event, function(pointer, touch) {
            var isflick =
                pointer.distance > 30 &&
                pointer.distance / pointer.duration > 0.65
            if (isflick) {
                var extra = {
                    deltaX: pointer.deltaX,
                    deltaY: pointer.deltaY,
                    touch: touch,
                    touchEvent: event,
                    direction: swipeRecognizer.getDirection(
                        pointer.deltaX,
                        pointer.deltaY
                    ),
                    isVertical: pointer.isVertical
                }
                var target = pointer.element
                Recognizer.fire(target, 'swipe', extra)
                Recognizer.fire(target, 'swipe' + extra.direction, extra)
            }
        })
    }
}

swipeRecognizer.touchcancel = swipeRecognizer.touchend
Recognizer.add('swipe', swipeRecognizer)

/*********************************************************************
 *                    DOMReady                                       *
 **********************************************************************/

var readyList = [],
    isReady
var fireReady = function(fn) {
    isReady = true
    var require = yua.require
    if (require && require.checkDeps) {
        modules['domReady!'].state = 4
        require.checkDeps()
    }
    while ((fn = readyList.shift())) {
        fn(yua)
    }
}

if (DOC.readyState === 'complete') {
    setTimeout(fireReady) //如果在domReady之外加载
} else {
    DOC.addEventListener('DOMContentLoaded', fireReady)
}
window.addEventListener('load', fireReady)
yua.ready = function(fn) {
    if (!isReady) {
        readyList.push(fn)
    } else {
        fn(yua)
    }
}

yua.config({
    loader: true
})
yua.ready(function() {
    yua.scan(DOC.body)
})

if (typeof define === 'function' && define.amd) {
    define('yua', [], function() {
        return yua
    })
}
// Map over yua in case of overwrite
var _yua = window.yua
yua.noConflict = function(deep) {
    if (deep && window.yua === yua) {
        window.yua = _yua
    }
    return yua
}
// Expose yua identifiers, even in AMD
// and CommonJS for browser emulators