要从jQuery的父级中选择所有子级，请使用find()方法。您可以尝试运行以下代码以选择任何级别的所有子代-
<!DOCTYPE html>
<html>
<head>
<style>
.myclass * {
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$('ul').find('*').css({"color": "red", "border": "2px solid green"});
});
</script>
</head>
<body>
<div class="myclass">
<div style="width:400px;">div - great-grandparent
<ul>ul
<li>li- child - level 1
<ul>ul- child - level 2
<li>li- child - level 3</li>
<li>li- child - level 3</li>
</ul>
</li>
</ul>
</div>
</div>
</body>
</html>