js控制checkbox全选和取消全选
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>全选-案例</title>
<style type="text/css">
#box{border-radius: 5px; border:1px solid; border-color: #ccc; margin: 20px auto;padding: 10px; width: 60px;}
</style>
<script type="text/javascript">
function chk(){
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 id="box">
<input type="checkbox" id="checkAll" onclick="chk()">全选<br>
<input type="checkbox" name="item[]">选1<br>
<input type="checkbox" name="item[]">选2<br>
<input type="checkbox" name="item[]">选3<br>
<input type="checkbox" name="item[]">选4<br>
<input type="checkbox" name="item[]">选5<br>
</div>
</body>
</html>