abstract：<!DOCTYPE html><html><head> <title>测试</title> <style type="text/css"> .box{width: 100px;height: 300px,border-radius:5px;padding: 5px 10px;margin: 20px aut
<!DOCTYPE html>
<html>
<head>
<title>测试</title>
<style type="text/css">
.box{width: 100px;height: 300px,border-radius:5px;padding: 5px 10px;margin: 20px auto;}
.box div{border-bottom: 2px solid #000; padding-bottom: 10px;margin-bottom: 8px;}
.box input{margin: 10px;}
</style>
</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>
</div>
<script type="text/javascript">
function checkAll(){
var checkall,item;
checkall = document.getElementById("checkall");
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>
</html>
Correcting teacher：韦小宝Correction time：2018-12-13 15:33:51
Teacher's summary：写的很不错！一键全选在实际的开发中随处可见十分重要，其中的原理一定要搞懂！课后还要多多练习！