diff --git a/index.js b/index.js
index 8900156..259e328 100644
--- a/index.js
+++ b/index.js
@@ -36,9 +36,8 @@ function hideProperty(host, name, value) {
 export default class Five {
   constructor() {
     hideProperty(this, '__FIVE__', Object.assign({}, init))
-    hideProperty(this, '__MODULES__', { __error__: null })
+    hideProperty(this, '__MODULES__', {})
     hideProperty(this, '__MIDDLEWARE__', [])
-    hideProperty(this, '__INSTANCE__', {})
   }
 
   __init__() {
@@ -94,63 +93,51 @@ export default class Five {
 
   // 获取全局配置
   get(key) {
-    try {
-      return new Function('o', `return o.${key}`)(this.__FIVE__)
-    } catch (err) {}
+    return this.__FIVE__[key]
   }
 
-  // 加载中间件/缓存模块
+  // 加载中间件
   // 与别的中间件用法有些不一样, 回调的传入参数中的req和res,
   // 并非原生的request对象和response对象,
   // 而是框架内部封装过的,可通过origin属性访问原生的对象
-  use(key, fn) {
-    if (arguments.length === 1) {
-      if (typeof key !== 'function') {
-        throw TypeError('argument 1 must be a callback')
-      }
-      this.__MIDDLEWARE__.push(key)
-    } else {
-      if (typeof key !== 'string') {
-        return
-      }
-      libs[key] = fn
+  use(fn) {
+    if (typeof fn === 'function') {
+      this.__MIDDLEWARE__.push(fn)
+      return this
     }
+    throw TypeError('argument must be a callback')
   }
-  // 预加载应用
+
+  // 预加载应用, 缓存以提高性能
   preload(dir) {
     var list = fs.ls(dir)
 
     if (list) {
-      list.forEach(file => {
-        var { name } = path.parse(file)
+      list.forEach(item => {
+        var { name } = path.parse(item)
         if (name.startsWith('.')) {
           return
         }
-        try {
-          this.__MODULES__[name] = import(file)
-        } catch (err) {
-          this.__MODULES__.__error__ = err
+        // 如果是目录,则默认加载index.js, 其他文件不加载
+        // 交由index.js自行处理, 用于复杂的应用
+        if (fs.isdir(item)) {
+          item = path.join(item, './index.js')
         }
+
+        this.__MODULES__[name] = import(item).catch(err => {
+          return { default: null }
+        })
       })
     }
 
     return this
   }
 
-  // 注册实例化对象到实例池中
+  // 注入实例化对象到实例池中
   // 与use方法不同的是, 这个会在server创建之前就已经执行
-  ins(name, fn) {
-    var _this = this
-    if (arguments.length === 1) {
-      return this.__INSTANCE__[name]
-    }
-    if (typeof fn === 'function') {
-      fn.call(this, this.__FIVE__, function next(instance) {
-        if (instance) {
-          _this.__INSTANCE__[name] = instance
-        }
-      })
-    }
+  install({ name, install }) {
+    this['$$' + name] = install.call(this, this.__FIVE__)
+    return this
   }
 
   // 启动http服务
diff --git a/lib/reg-init.js b/lib/reg-init.js
index 2a8c0cf..b1c2c2f 100644
--- a/lib/reg-init.js
+++ b/lib/reg-init.js
@@ -1,11 +1,11 @@
 /**
- *
- * @authors yutent (yutent@doui.cc)
- * @date    2016-05-15 14:37:47
- *
+ * 部分配置
+ * @author yutent<yutent.io@gmail.com>
+ * @date 2020/09/22 17:19:39
  */
 
-'use strict'
+const ENV_PROD = 'production'
+const ENV_DEV = 'development'
 
 export default {
   db: {},
@@ -24,27 +24,30 @@ export default {
   domain: '', // cookie域, 默认等于website
   port: 3000,
   routeMode: 'action', // action | __main__
-  env: process.env.NODE_ENV === 'production' ? 'production' : 'development',
-  debug: process.env.NODE_ENV !== 'production', // debug模式
+  env: process.env.NODE_ENV === ENV_PROD ? ENV_PROD : ENV_DEV,
+  debug: process.env.NODE_ENV === ENV_DEV, // debug模式
   smtp: {
     host: 'smtp.example.com',
     port: 25,
-    mail: 'service@example.com',
-    name: '系统邮件',
+    mail: 'no-reply@example.com',
+    name: 'no-reply',
     passwd: ''
   },
-  supportCredentials: false,
-  credentialsRule: null,
-  credentialsMaxAge: 0,
+  cors: {
+    enabled: false,
+    credentials: false,
+    origin: [], // ['abc.com', 'a.foo.com']
+    maxAge: 0
+  },
   jwt: null, // jwt secret
   regexp: {
     // 常用正则
     email: /^[\w\.\-]+@\w+([\.\-]\w+)*\.\w+$/,
     uname: /^[A-Za-z\d_]{4,16}$/,
-    passwd: /^[\S]{6,20}$/,
-    phone: /^1[34578]\d{9}$/,
+    passwd: /^\S{6,20}$/,
+    phone: /^1[3456789]\d{9}$/,
     idCard: /^[1-9]\d{5}[1-9]\d{3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}([0-9]|X|x)$/,
-    CN: /^[\u4e00-\u9fa5]+$/,
+    cn: /^[\u4e00-\u9fa5]+$/,
     qq: /^\d{5,12}$/
   }
 }
diff --git a/middleware/credentials.js b/middleware/credentials.js
index 9190289..878221e 100644
--- a/middleware/credentials.js
+++ b/middleware/credentials.js
@@ -7,28 +7,29 @@
 import url from 'url'
 
 export default function(req, res, next) {
-  var supportCredentials = this.get('supportCredentials')
-  var credentialsRule = this.get('credentialsRule')
-  var credentialsMaxAge = this.get('credentialsMaxAge')
+  var CORS = this.get('cors')
 
-  if (supportCredentials) {
+  if (CORS.enabled) {
     var origin = req.header('origin') || req.header('referer') || ''
     var headers = req.header('access-control-request-headers')
-    origin = url.parse(origin)
+    var { hostname, host, protocol } = url.parse(origin)
 
-    if (credentialsRule && origin.hostname) {
-      if (!credentialsRule.test(origin.hostname)) {
+    if (CORS.origin.length && hostname) {
+      if (!CORS.origin.includes(hostname)) {
         return res.end('')
       }
     }
     res.set('Access-Control-Allow-Credentials', 'true')
-    res.set('Access-Control-Allow-Origin', `${origin.protocol}//${origin.host}`)
+    res.set('Access-Control-Allow-Origin', `${protocol}//${host}`)
+
     if (headers) {
       res.set('Access-Control-Allow-Headers', headers)
     }
-    if (credentialsMaxAge) {
-      res.set('Access-Control-Max-Age', credentialsMaxAge)
+
+    if (CORS.maxAge) {
+      res.set('Access-Control-Max-Age', CORS.maxAge)
     }
+
     if (req.method === 'OPTIONS') {
       return res.end('')
     }
diff --git a/middleware/router.js b/middleware/router.js
index 5af491f..343d7b8 100644
--- a/middleware/router.js
+++ b/middleware/router.js
@@ -6,18 +6,14 @@
 
 export default function(req, res, next) {
   var debug = this.get('debug')
+  if (this.__MODULES__.__error__) {
+    var err = this.__MODULES__.__error__
+    return res.error(debug ? err.stack || err : err, err.status || 500)
+  }
 
   // 1. 先判断控制器是否存在
   if (!this.__MODULES__[req.app]) {
-    if (this.__MODULES__.__error__) {
-      res.error(
-        debug ? this.__MODULES__.__error__.stack : this.__MODULES__.__error__,
-        500
-      )
-    } else {
-      res.error(`Controller [${req.app}] not found`, 404)
-    }
-    return
+    return res.error(`Controller [${req.app}] not found`, 404)
   }
 
   // 2. 默认二级路由为index
@@ -28,29 +24,35 @@ export default function(req, res, next) {
   // 3. 实例化控制器
   this.__MODULES__[req.app]
     .then(({ default: Mod }) => {
-      var app = new Mod({ ctx: this, req, res })
-      var err = ''
+      var app,
+        err = ''
+      if (Mod) {
+        app = new Mod({ ctx: this, req, res })
 
-      // action模式, 则路由自动调用对应的action方法
-      // __main__模式, 则路由全部走__main__方法
-      if (this.get('routeMode') === 'action') {
-        var route = req.path.shift()
-        var act = route + 'Action'
+        // action模式, 则路由自动调用对应的action方法
+        // __main__模式, 则路由全部走__main__方法
+        if (this.get('routeMode') === 'action') {
+          var route = req.path.shift()
+          var act = route + 'Action'
 
-        if (app[act]) {
-          return app[act].apply(app, req.path)
+          if (app[act]) {
+            return app[act].apply(app, req.path)
+          } else {
+            err = new Error(`Route [${route}] not found`)
+          }
         } else {
-          err = new Error(`Route [${route}] not found`)
+          if (app.__main__) {
+            return app.__main__.apply(app, req.path)
+          } else {
+            err = new Error('__main__() not found')
+          }
         }
+        err.status = 404
       } else {
-        if (app.__main__) {
-          return app.__main__.apply(app, req.path)
-        } else {
-          err = new Error('__main__() not found')
-        }
+        err = new Error(`Controller [${req.app}] load error`)
+        err.status = 500
       }
 
-      err.status = 404
       return Promise.reject(err)
     })
     .catch(err => {