<html>
<head>
<script>
functionantichose()
{for(i=0;i<form1.checkbox.length;i++)
{s="document.form1.checkbox["+i+"].click();";
eval(s);}
}
functionallchose()
{for(i=0;i<form1.checkbox.length;i++)
{s="document.form1.checkbox["+i+"].checked=true;";
eval(s);}
}
</script>
</head>
<body>
<formname=form1>
<inputtype=checkbox name=checkbox>
<inputtype=checkbox name=checkbox>
<inputtype=checkbox name=checkbox>
<inputtype=checkbox name=checkbox>
<inputtype=button οnclick="allchose();"value="全选">
<inputtype=button οnclick="antichose();" value="反选">
</form>
</body>
</html>