JavaScript实现在文本框中输入空格时自动填写某个值

  <script language="javascript" type="text/javascript">

      var txtText4 = "#" + '<%= new DynamicControl(this, "Text4").ClientID%>';

      $(function () {

                 $(txtText4).keyup(function (e) {

              if (e.which == 32)

                  $(this).val("TEXT");

          });

      });

   </script>