CheckBox实现全选/全不选的通用js 替换DataList1即可

<script type="text/javascript" language="javascript">
    function SelectAll(box,status)
    {
        var table;
        if(status==1)
        {
            table = document.getElementById("DataList1");   //获得datalist           
        }
        else if(status==2)
        {
            table = document.getElementById("DataList2");   //获得datalist           
        }

      var checkes =table.getElementsByTagName("input");

     for(var i=0;i<checkes.length;i++)
      {
           if(box.checked == true)
            {
                if(checkes[i].type=="checkbox")
                {
                    checkes[i].checked=true;
                }
            }
            else
            {
                if(checkes[i].type=="checkbox")
                {
                   checkes[i].checked=false;
                }
            }
      }
   }
</script>