abstract：<!DOCTYPE html><html><head> <title>全选</title> <style type="text/css"> .box{ width: 200px;height: 250;border:1px solid #ccc;border-radius: 5px;padding:
<!DOCTYPE html>
<html>
<head>
<title>全选</title>
<style type="text/css">
.box{
width: 200px;height: 250;border:1px solid #ccc;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");
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>
</head>
<body>
<div class="box">
<div>
<input type="checkbox" name="" onclick="checkall()" id="checkall">
<label>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>
</div>
</body>
</html>
总结：按钮通过点击事件触发全选的方法，通过循环给没有选中的复选框添加选中的状态
Correcting teacher：灭绝师太Correction time：2019-03-18 09:27:20
Teacher's summary：完成的很好,全选效果后期使用场景较多,要好好掌握!