jQuery拥有隐士迭代 随便添加checkebox也没关系
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./jquery.mini.js"></script>
</head>
<body>
<input type="checkbox" class="checkall">
<input type="checkbox" class="checka">
<input type="checkbox" class="checka">
<input type="checkbox" class="checka">
<input type="checkbox" class="checka">
<script>
$(function(){
$(".checkall").change(function(){
// console.log($(this).prop("checked"));
$(this).siblings().prop("checked",$(this).prop("checked"));
})
$(".checka").change(function(){
if($(".checka:checked").length==$(".checka").length){
$(".checkall").prop("checked",true)
}else{
$(".checkall").prop("checked",false)
}
})
})
</script>
</body>
</html>yds