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全部选中复选框

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3  <head> 4   <title> new document </title> 5   <meta name="generator" content="editplus" /> 6   <meta name="author" content="" /> 7   <meta name="keywords" content="" /> 8   <meta name="description" content="" /> 9   <script type="text/javascript">10   function test(sta){11     var chk = document.getElementsByTagName(input);12     for (var i=0;i<7 ;i++ ){13         chk[i].checked= sta;14 15     }16   }17   </script>18  </head>19 20  <body>21  <input type="checkbox" value="" /><br/>22  <input type="checkbox" value="" /><br/>23  <input type="checkbox" value="" /><br/>24  <input type="checkbox" value="" /><br/>25  <input type="checkbox" value="" /><br/>26  <input type="checkbox" value="" /><br/>27  <input type="checkbox" value="" /><br/>28 29   <input type="button" value="全选"onclick="test(‘checked‘);">30    <input type="button" value="全不选"onclick="test(‘‘);">31  </body>32 </html>

 

全部选中复选框