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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">
  <h2>导航对齐方式</h2>
  <p>可以在 .nav 元素上添加 .justify-content-center CSS 类设置导航居中显示<br/>添加 .justify-content-end CSS 类设置导航右对齐</p>
  <ul class="nav">
    <li class="nav-item">
      <a class="nav-link" href="#">默认</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>
  <ul class="nav justify-content-center">
    <li class="nav-item">
      <a class="nav-link" href="#">居中对齐</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>
  <ul class="nav justify-content-end">
    <li class="nav-item">
      <a class="nav-link" href="#">右对齐</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>
</div>

运行结果：