`

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<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>-->  1 <SCRIPT LANGUAGE="JavaScript">
 2 
 3 var checkflag = false;
 4     function check(field) 
 5     {
 6 
 7         
 8         if (checkflag == false
 9         {
10     
11         if(field.length==null)
12         {
13     
14             field.checked=true;
15             checkflag =true;
16             //return false;
17     
18         }
19 
20             for (i = 0; i < field.length; i++
21             {
22                 
23                 field[i].checked = true;
24             }
25             checkflag = true;
26             //return "false"; 
27         }else 
28         {
29 
30         if(field.length==null)
31         {
32     
33             field.checked=false;
34             checkflag =false;
35             //return true;
36     
37         }
38             for (i = 0; i < field.length; i++
39             {
40                 field[i].checked = false
41             }
42             checkflag = false;
43             //return true; 
44         }
45     }
46 </script>
47 
48 <html>
49 <head>
50 <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
51 <title>无标题文档</title>
52 </head>
53 
54 <body>
55 <form name="form1" method="post" action="">
56   <p>
57     <input type="checkbox" name="ckbox" value="checkbox"> 
58     dfg  </p>
59   <p>
60   <input type="checkbox" name="ckbox" value="checkbox"> 
61     dfg  
62 </p>
63   <p><br>
64   <input type="checkbox" name="全选" onClick="this.value=check(this.form.ckbox)">    
65        全选</p>
66   <p>&nbsp;  </p>
67 </form>
68 </body>
69 </html>
70 



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