跨浏览器的 mouseenter mouseleave 以及 compareDocumentPosition的使用说明

            sFlags = sFlags.split(',');
            for (var i = 0, len = sFlags.length; i < len; i++) this._flags[sFlags[i]] = 1 << i;

           //这里初始化标识的值 如果同时具备n种状态 则 每种状态的值一定是 000001  000010 000100 001000 010000 100000 
        },
        setStatus: function(sFlags) { //sFlags "状态1,状态3......设置当前状态
            sFlags = sFlags.split(',');

　　　　this._status=0;
            for (var i = 0, len = sFlags.length; i < len; i++) {
                this._check[sFlags[i]];
                this._status |= this._flags[sFlags[i]];
            }
        },
        addStatus: function(sFlags) {//sFlags "状态1,状态3......检查当前状态标示 是否有 状态1和状态3 如果没有则添加
            sFlags = sFlags.split(',');
            for (var i = 0, len = sFlags.length; i < len; i++) {
                this._check(sFlags[i]);
                if (this.hasStatus(sFlags[i])) continue; //判断是否已经有这个状态如果有 跳过.
                this._status |= this._flags[sFlags[i]];

                //当前的状态值 与 允许的标识值 做 | 运算 即添加状态
            }
        },
        removeStatus: function(sFlags) {
            sFlags = sFlags.split(',');
            for (var i = 0, len = sFlags.length; i < len; i++) {
                this._check(sFlags[i]);
                if (!this.hasStatus(sFlags[i])) continue;
                this._status ^= this._flags[sFlags[i]];