全选框小案例
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>全选</title>
<style type="text/css">
#box{width: 120px;height: 250px;border: 1px solid #000;border-radius: 5px;padding: 5px 10px;margin: 20px auto;}
#box div{border-bottom: 1px solid #ccc;padding-bottom: 10px;margin-bottom: 8px;}
#box input{margin: 8px;}
</style>
<script type="text/javascript">
function checkAll(){
var checkall,item;
checkall=document.getElementById('checkall')//获取全选
item=document.getElementsByName("item[]")//获取下面的选框
for (var i=0;i<item.length;i++){
if(checkall.checked){
item[i].checked=true//当全选框被选中时下面的勾选框选中
}else{
item[i].checked=false//反之清空
}
}
}
</script>
</head>
<body>
<div id="box">
<div>
<input type="checkbox" id="checkall" onclick="checkAll()"><label for="checkall">全选</label>
</div>
<input type="checkbox" name="item[]" id="item[]">选项1<br>
<input type="checkbox" name="item[]" id="item[]">选项2<br>
<input type="checkbox" name="item[]" id="item[]">选项4<br>
<input type="checkbox" name="item[]" id="item[]">选项5<br>
<input type="checkbox" name="item[]" id="item[]">选项5
</div>
</body>
</html>