html - 大屏幕上的 Bootstrap 导航栏折叠按钮？

Question

我的网站上有一个 Bootstrap 导航栏，我需要让导航栏折叠按钮在大屏幕上像在移动设备上一样工作。我该怎么做？

<nav class="navbar navbar-expand-md navbar-light bg-light">
    <a class="navbar-brand" href="#">Default</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbar-toggle" aria-controls="navbar-toggle" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbar-toggle">
        <ul class="navbar-nav mr-auto mt-2 mt-lg-0">
            <li class="nav-item">
                <a class="nav-link">A</a>
            </li>
        </ul>
    </div>
</nav>

Answer 1

删除适用于您的 navbar-expand-* 类

<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>

Collapsing Always
<nav class="navbar bg-dark navbar-dark">
  <a class="navbar-brand" href="#">Navbar</a>
  <button
    class="navbar-toggler"
    type="button"
    data-toggle="collapse"
    data-target="#collapsibleNavbar"
  >
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="collapsibleNavbar">
    <ul class="navbar-nav">
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
    </ul>
  </div>
</nav>

Not Collapsing
<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
  <a class="navbar-brand" href="#">Navbar</a>
  <button
    class="navbar-toggler"
    type="button"
    data-toggle="collapse"
    data-target="#collapsibleNavbar"
  >
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="collapsibleNavbar">
    <ul class="navbar-nav">
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
    </ul>
  </div>
</nav>