<td align="left"  ><input type="checkbox" id="ckQCQF"></input>群测群防</td>

            <td colspan="4"><%=Html.TextBoxFor(c => c.MASSMONITORING, new { @id = "MassMonitoring", @disabled = "disabled" })%></td>

 

$("#ckQCQF").click(function () {

              var Isck = $("#ckQCQF").attr("checked");

              if (Isck == "checked") {

                  $("#MassMonitoring").removeAttr("disabled");

              }

              else {

                  $("#MassMonitoring").attr({ "disabled": "disabled" });

              }

          })