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);
            }
        });
    };