Bootstrap 4:如何在没有jQuery /最小bootstrap.js的情况下使用NavBars？

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/css/bootstrap.min.css">

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Logo</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNav">
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">About</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Services</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Contact</a>
      </li>
    </ul>
  </div>
</nav>

<nav class="navbar navbar-expand-lg navbar-light bg-light fixed-top">
  <!-- 导航栏内容 -->
</nav>

<script>
  document.addEventListener("DOMContentLoaded", function() {
    var navbarToggler = document.querySelector(".navbar-toggler");
    var navbarCollapse = document.querySelector(".navbar-collapse");

    navbarToggler.addEventListener("click", function() {
      navbarCollapse.classList.toggle("show");
    });
  });
</script>