<td><input id="chkall" type="checkbox" onclick="chkall();" />全选/取消</td>
 1 <script type="text/javascript">
 2         function chkall()
 3         {
 4             //debugger;
 5             var chkall= document.all["chkall"];
 6             var chkother= document.getelementsbytagname("input");
 7             for (var i=0;i<chkother.length;i++)
 8             {
 9                 if( chkother[i].type==checkbox)
10                 {
11                     if(chkother[i].id.indexof(treeview1)>-1)
12                     {
13                         if(chkall.checked==true)
14                         {
15                             chkother[i].checked=true;
16                         }
17                         else
18                         {
19                             chkother[i].checked=false;
20                         }
21                     }
22                 }
23             }
24         }
25     </script>

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