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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>
<div class="container">
    <br/>
    <h1>图片自适应导航栏</h1>
    <nav class="navbar navbar-expand-sm bg-dark navbar-dark">
      <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>
    <br/>
    
    <p>如果使用图片，可以使用 .navbar-brand 设置图片自适应导航栏

</p>
</div>

运行结果：