js键值对对象

<script type="text/javascript">
        function getKeyVal() {
            var _KeyVal = new Object();
            _KeyVal.set = function (key, value) {
                if (arguments.length >= 2) {
                    this[arguments[0]] = arguments[1];
                }
            };
            _KeyVal.get = function (key) {
                if (this.hasOwnProperty(arguments[0])) {
                    return this[arguments[0]];
                }
            };
            _KeyVal.remove = function (key) {
                if (this.hasOwnProperty(arguments[0])) {
                    delete this[arguments[0]];
                }
            };
            _KeyVal.clear = function () {
                for (var e in this) {
                    delete this[e];
                }
            };
            _KeyVal.ishav = function (key) {
                return this.hasOwnProperty(arguments[0]);
            };
            _KeyVal.Vals = function () {
                var valarr = new Array();
                for (var v in this) {
                    if (typeof (this[v]) != "function") {
                        valarr.push(v);
                    }
                }
                return valarr;
            };
            _KeyVal.Keys = function () {
                var keyarr = new Array();
                for (var k in this) {
                    if (typeof (this[k]) != "function") {
                        keyarr.push(this[k]);
                    }
                }
                return keyarr;
            };
            return _KeyVal;
        }

            var KeyVal = getKeyVal();       //获取键值对对象
        KeyVal.set("l1", "11");         //添加键值对 参数1:键名,参数2:键值
        KeyVal.set("l2", "22");         //添加键值对 参数1:键名,参数2:键值

        KeyVal.set("l1", "33");         //添加键值对 参数1:键名,参数2:键值
        var a1 = KeyVal.ishav("l1");    //查看键名是否存在 有返回true
            var a2 = KeyVal.get("l1");      //获取给定键的值

        KeyVal.remove("l1");            //删除给定键名的键
        var a3 = KeyVal.ishav("l1");    //查看键名是否存在 没有返回false
            var a4 = KeyVal.get("l1");      //获取给定键的值 键不存在返undefined

        //KeyVal.clear();               //清除所有属性 方法也会清除不好用
        KeyVal.set("l3", "66");         //添加键值对 参数1:键名,参数2:键值
        var arr1 = KeyVal.Vals();//返回值得数组
            var arr2 = KeyVal.Keys();//返回键名的数组


        var abc = "abc";
    </script>