我的学习作业
背后捅人刀2019-03-12 22:58:24243<!DOCTYPE html>
<html dir="ltr">
<head>
<meta charset="utf-8">
<title>全选</title>
<style media="screen">
.box{width:100px;height:130px;border:1px solid red;margin:50px auto;padding:10px;}
.box div{border-bottom:1px solid red; padding-bottom:10px;margin-bottom:10px}
</style>
</head>
<body>
<div><div>
<input type="checkbox" name="item[]" id="checkall" onclick="checkAll()" value=""><label for="checkall">全选</label><br></div>
<input type="checkbox" name="item[]" value="">1<br>
<input type="checkbox" name="item[]" value="">2<br>
<input type="checkbox" name="item[]" value="">3<br>
<input type="checkbox" name="item[]" value="">4</div>
</body>
<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>
</html>