abstract：<!DOCTYPE html><html><head> <title>案例全选</title> <style type="text/css"> .box{ height:300px; width:100px;
<!DOCTYPE html>
<html>
<head>
<title>案例全选</title>
<style type="text/css">
.box{
height:300px;
width:100px;
border:1px solid #ccc;
margin:20px auto;
padding:15px 30px;
text-align:center;
}
.box_1{
margin-bottom:10px;
border-bottom:1px solid #ccc;
padding-bottom:30px;
}
</style>
<script type="text/javascript">
function checkAll(){
var checkall,item;
checkall=document.getElementById("checkall")//获取全选
item=document.getElementsByName("item[]")//获取下面的勾选框
for(var i=0;i<item.length;i++){
if(checkall.checked){
item[i].checked=true //当全选框选中时，勾选框选中
}else{
item[i].checked=false //反之
}
}
}
</script>
</head>
<body>
<div class="box">
<div class="box_1">
<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>
<input type="checkbox" name="item[]">选项6<br>
</div>
</body>
</html>
Correcting teacher：天蓬老师Correction time：2018-11-15 15:22:24
Teacher's summary：本例涉及事件添加,函数声明,以及根据name属性获取元素知识,写得很好
