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代码编辑器：

<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="/static/lib/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="/static/lib/jquery/3.3.1/jquery.min.js"></script>
<script src="/static/lib/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="/static/lib/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<body style="height:1500px">
<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
  <a class="navbar-brand" href="#">
    <img src="/static/icon/bootstrap_32x32.png" alt="Logo" style="width:32px;" />
  </a>
  <ul class="navbar-nav">
    <li class="nav-item">
      <a class="nav-link" href="#">首页</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Python</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">PHP</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Perl</a>
    </li>
  </ul>
</nav>
<div class="container" style="margin-top:64px">
    <h1>固定导航栏在页面顶部</h1>
    <p>在 .navbar 元素上添加 .navbar-fixed-top CSS 类用于设置导航栏固定在页面顶部</p>
</div>
</body>

运行结果：