<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
.active {
color: red;
}
li {
cursor: pointer;
}
</style>
</head>
<body>
<ul>
<li>第1个li元素</li>
<li>第2个li元素</li>
<li class="active">第3个li元素</li>
<li>第4个li元素</li>
</ul>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
var $active=$('.active');
var $suoyou=$active.siblings()
console.log($suoyou);
</script>
</body>
</html>