ID选择器

    <script src="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="我是txt1的value," />