js 深复制对象

/**         * 深复制对象         */        (function () {            //深复制对象方法            var cloneObj = function (obj) {                var newO = {};                if (obj instanceof Array) {                    newO = [];                }                for (var key in obj) {                    var val = obj[key];                    newO[key] = typeof val === 'object' ? arguments.callee(val) : val;                }                return newO;            };            //测试            var a = {a:{a:123}},                    b = cloneObj(a);            b.a.a = 456;            alert(a.a.a);        })();