var obj = { a: "aaaaaa" };

            var obj1 = { b: "bbbbbb" };

            Object.extend = function (destination, source) {

                for (property in source) {

                    destination[property] = source[property];

                }

                return destination;

            }

            Object.extend(obj, obj1);

            alert(JSON.stringify(obj)); //结果为{"a":"aaaaaa","b":"bbbbbb"}