input全选
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>全选</title>
<style type="text/css">
.box{width: 100px;height: 200px;border: 1px solid #ccc;border-radius: 6px; margin:20px auto;}
.box div{border: 1px solid #aaa;border-radius: 6px; margin:20px auto;}
.box input{border: 1px solid #fff;border-radius: 6px; margin:20px auto;}
</style>
<script type="text/javascript">
function checkall(){
var checkall,item;
checkall=document.getElementById("check_all");
item=document.getElementsByName("item[]");
for (var i=0;i<item.length;i++){
if(checkall.checked){
item[i].checked=true;
}else{
item[i].checked=false;
}
}
}
</script>
<body>
<div class="box"></div>
<div>
<input type="checkbox" id="check_all" onclick="checkall()"><label for="check_all">全选</label>
<input type="checkbox" name="item[]">选 1<br>
<input type="checkbox" name="item[]">选 2<br>
<input type="checkbox" name="item[]">选 3<br>
<input type="checkbox" name="item[]">选 4<br>
<input type="checkbox" name="item[]">选 5 <br>
<input type="checkbox" name="item[]">选 6<br>
</div>
</body>
</html>