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<!DOCTYPE html>
<html>
<head>
<title>全选</title>
<style type="text/css">
.box{width: 120px; height: 250px; border: 1px solid #ccc; border-radius: 5px 10px; padding: 0px 10px; margin: 20px auto; }
.box div{ border-bottom: 1px solid #ccc; padding-bottom: 10px; margin-bottom: 8px;}
.box div input{margin: 8px;}
</style>
<script type="text/javascript">
function checkAll(){
var chackall,item;
checkall=document.getElementById('checkall')//获取全选
item=document.getElementsByName('item[]') //获取勾选框
for (var i=0;i<item.length;i++){
if (checkall.checked){
item[i].checked=true //当选框被选中是，。勾选框选中
}else{
item[i].checked=false //反之
}
}
}
</script>
</head>
<body>
<div class="box">
<div>
<input type="checkbox" id="checkall" onclick="checkAll()"><label for="checkall">全选</label>
</div>
<input type="checkbox" name="item[]">选项1<br>
<input type="checkbox" name="item[]">选项2<br>
<input type="checkbox" name="item[]">选项3<br>
<input type="checkbox" name="item[]">选项4<br>
<input type="checkbox" name="item[]">选项5<br>
<input type="checkbox" name="item[]">选项6<br>
<input type="checkbox" name="item[]">选项7<br>
</div>
</body>
</html>
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