a.aspx页面继承master.page在a.aspx页面里面有
<script language="javascript" type="text/javascript">
      function CheckAll(oCheckbox)
      {
           var gvTemp = document.getElementById("<%=gvMain.ClientID %>");
           //var gvTemp = document.getElementById("ctl00_ContentPlaceHolder1_gvMain");
           alert(gvTemp); 
           for(i=1; i<gvTemp.rows.length; i++)
           {
                gvTemp.rows[i].cells[0].getElementsByTagName("INPUT")[0].checked = oCheckbox.checked;
           }
      }
    </script>
gvTemp为null,请问怎么解决,谢谢!