vue 数据监听原理

     Vue.prototype.listenDatas = function(){
         for(var attr in this.$data){
             this.listenData(this,attr,this.$data);
             if(Array.isArray(this.$data[attr])){
                 this.$data[attr].__proto__ = this.newArrMethods;
                 for(var i=0;i<this.$data[attr].length;i++){
                     for(var attr_child in this.$data[attr][i]){
                         this.listenData(this.$data[attr][i],attr_child,this.cloneObj(this.$data[attr][i]));
                     }
                 }
             }
         }
     };
     Vue.prototype.listenData = function(obj,attr,data){
         var This = this;
         Object.defineProperty(obj, attr, {
             configurable : true,
             enumerable : true,
             get : function(){
                 return data[attr];
             },
             set : function(val){
                 data[attr] = val;
                 This.render(This.$temp);
             }
         });
     };