<!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.jsdelivr.net/npm/bootstrap@5.1.2/dist/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
<nav class="navbar navbar-expand-sm bg-light">
<div class="container-fluid">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">链接 1</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">链接 2</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">链接 3</a>
</li>
</ul>
</div>
</nav>
<div class="container-fluid mt-3">
<h3>基础的导航栏</h3>
<p>导航栏是位于页面顶部的导航标题。</p>
<p>navbar-expand-xxl|xl|lg|md|sm 类确定导航栏何时应垂直堆叠（在特大、超大、大、中或小屏幕上）。</p>
</div>
</body>
</html>