<script src="http://www.mamicode.com/Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>    <script type="text/javascript">        $(function () {            Test("txt1");        });        function Test(id) {            alert($("#" + id).val());                       // alert($(id).val(););        }    </script>        <input type="text" name="name" id="txt1" value="http://www.mamicode.com/我是txt1的value," />