//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
      Anot.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()