abstract：<!DOCTYPE html><html><head><meta charset="UTF-8"><title>javascript</title><style type="text/css"> .box{width:120px;height:250px;border:1px
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>javascript</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 #000;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.getElementByName("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" id="checkall" onclik="checkAll()"><lable for="checkall">全选</lable>
</div>
<input type="checkbox" name="item[]">选择1<br>
<input type="checkbox" name="item[]">选择2<br>
<input type="checkbox" name="item[]">选择3<br>
<input type="checkbox" name="item[]">选择4<br>
<input type="checkbox" name="item[]">选择5<br>
<input type="checkbox" name="item[]">选择6<br>
<input type="checkbox" name="item[]">选择7<br>
</div>
</body>
</html>
Correcting teacher：天蓬老师Correction time：2019-06-13 17:08:04
Teacher's summary：全选 的精华在于chebox的name属性的值,要通过一个数组来存储, 这样才可以实现多选