<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www./TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www./1999/xhtml"> <head runat="server"> <title>无标题页</title> <script type="text/javascript"> function selcheck() { var objs=document.getElementsByTagName("input"); for(var i=0;i<objs.length;i++) { if(objs[i].type.toLowerCase() == "checkbox") objs[i].checked = true; } } function clearcheck() { var objs=document.getElementsByTagName("input"); for(var i=0;i<objs.length;i++) { if(objs[i].type.toLowerCase()=="checkbox") objs[i].checked=false; } } </script>
</head> <body> <form id="a" action=""> <table> <tr><td><input type="checkbox" name="1" value="a" /></td></tr> <tr><td><input type="checkbox" name="2" value="vb" /></td></tr> <tr><td><input type="checkbox" name="3" value="c" /></td></tr> </table> <br /> <input type="button" name="select" value="全 选" onclick="selcheck()"/> <input type="button" name="select" value="取 消" onclick="clearcheck()"/> </form> </body> </html> 注意checkbox 的 name 的规律
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