jquery实现文本框鼠标右击无效以及不能输入的代码

  <asp:TextBox ID="NodeText" runat="server"></asp:TextBox>    <script src="JS/jquery-1.4.2.js" type="text/javascript"></script>    <script type="text/javascript">        $(function() {  $("input#NodeText").bind({ contextmenu: function(e) {                if (e.which == 3)                    return false;            },                keyup: function() {                    $(this).val("");                }            });   });    </script>