深度克隆

deepClone: function (obj) {

    //返回传递给他的任意对象的类
    var isClass = function (o) {
        if (o === null) return "Null";
        if (o === undefined) return "Undefined";
        return Object.prototype.toString.call(o).slice(8, -1);
    };

    //深度克隆
    var deepClone = function (obj) {
        var result, oClass = isClass(obj);
        //确定result的类型
        if (oClass === "Object") {
            result = {};
        } else if (oClass === "Array") {
            result = [];
        } else {
            return obj;
        }
        for (key in obj) {
            var copy = obj[key];
            if (isClass(copy) == "Object") {
                result[key] = arguments.callee(copy);//递归调用
            } else if (isClass(copy) == "Array") {
                result[key] = arguments.callee(copy);
            } else {
                result[key] = obj[key];
            }
        }
        return result;
    };

    return deepClone(obj);
}