javascript面向对象之参数扩展(仿jquery extend)

<script>

        Object.prototype.extend = function (para) {
            for (var key1 in this) {
                para[key1] = this[key1];
            }
            return para;
        }

        function afun(para) {
            para=para.extend(
            {name:"li"}
            );
            alert(para.name);
        }
        afun({name:"zhang"});
    </script>