[cp]<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script type="text/javascript">
window.onload=function(){
}
function myfunc(chk){
var chklist=document.getElementsByName('chkstu');
for(var i=0;i<chklist.length;i++){
chklist[i].checked=chk.checked;
}
}
</script>
</head>
<body>
<table border="1" width="300" height="200">
<thead>
<tr>
<td><input type="checkbox" id="checkall" onclick="myfunc(this)">全选</td>
<td>学号</td>
<td>姓名</td>
<td>年龄</td>
</tr>
</thead>
<tbody>
<tr>
<td><input type="checkbox" name="chkstu"></td>
<td>1001</td>
<td>张三</td>
<td>18</td>
</tr>
<tr>
<td><input type="checkbox" name="chkstu"></td>
<td>1002</td>
<td>莉莉丝</td>
<td>18</td>
</tr>
<tr>
<td><input type="checkbox" name="chkstu"></td>
<td>1003</td>
<td>薇薇安</td>
<td>18</td>
</tr>
</tbody>
</table>
</body>
</html>[/cp]