<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script
function selected() {
var allsel=document.getElementsByName("car");
for(var i=0;i<allsel.length;i++)
{ allsel[i].checked=!allsel[i].checked; }
}
</script>
</head>
<body>
<h1>全选/全不选</h1> 全选/取消<br />
<input type="checkbox" > <br/>
<input type="checkbox" >aa<br/>
<input type="checkbox" >cc<br/> </body> </html>