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<!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 style="height:1500px"> <nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top"> <div class="container-fluid"> <a class="navbar-brand" href="#">固定在顶部</a> </div> </nav> <div class="container-fluid" style="margin-top:80px"> <h3>固定在顶部的导航栏</h3> <p>固定导航栏在独立于页面滚动的固定位置（顶部或底部）保持可见。</p> <h1>请滚动此页面来查看效果</h1> </div> </body> </html>