回调中如何实现冒泡?

/*通过将记录每个属性的父级,当属性值变化,逐级寻找回调最开始,打算在data上附加父级信息,后来感觉头快爆炸了,实现太麻烦,无法通过属性来获取父级对象名字,最后想到元素的parentNode , 不需要做成链式的,每个子属性,只需要记住它的父元素就行了.*/    (function(){        window.Observer = function(data){            this.data=data;            this.makeObserver();        };        var oP = Observer.prototype;        oP.watchArr = {};        //保存父级信息        oP._parentNode = {};        //父级初始化为空        oP._parent = '';        oP.makeObserver = function(){            for(var key in this.data){                  if(!this.data.hasOwnProperty(key))return;                var val = this.data[key];                //设置父级表                this._parentNode[key] = this._parent;                if(typeof val === 'object'){                    oP._parent = key;                    //递归时将当前key设置为父级                    new Observer(val);                };                this.setObserver(val,key);            };        };        oP.setObserver = function(val,key){            var that = this;            Object.defineProperty(that.data,key,{                enumerable: true,                configurable: true,                get:function(){                    return val;                },                set:function(newValue){                    if(typeof newValue === 'object'){                        new Observer(newValue);                    };                    if(val === newValue)return;                    //触发set时,执行冒泡                    oP.bubbleWatch(key,newValue,val);                    val = newValue;                }            });         };        oP.bubbleWatch = function(key,newValue,val){                if(this.watchArr[key]){            //如果监听表存在key,执行一次                this.implementWatch(key,newValue,val);            //如果冒泡选项为false,则return                if(!this.watchArr[key].options.bubble)return;            };            //剩下冒泡为true的,递归调用父级属性的回调            parentKey = this.getParent(key);            if(parentKey)this.bubbleWatch(parentKey,newValue,val);        };        oP.getParent = function(key){            var parent = this._parentNode[key];                 return parent;        };        oP.implementWatch = function(key,newValue,val){                     for(var i = 0;i