代码示例：（标识：bs_dropdown-menu-right）
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap 实例</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/js/bootstrap.bundle.js"></script>
</head>
<body>
<div class="p-4">
<h2>下拉菜单</h2>
<p>将 .dropdown-menu-end 类添加到 .dropdown-menu 可右对齐下拉菜单。</p>
<div class="dropdown dropdown-menu-end">
<button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown">
用于演示此例的宽的下拉按钮
</button>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="#">链接 1</a></li>
<li><a class="dropdown-item" href="#">链接 2</a></li>
<li><a class="dropdown-item" href="#">链接 3</a></li>
</ul>
</div>
</div>
</body>
</html>
