导航栏在 bootstrap 3.3.7 中没有折叠

Question

我使用的是 bootstrap 3.3.7，我的导航栏在较小的设备上没有折叠。导航栏确实出现，但单击 navbar-toggle 按钮不会显示任何选项。

<nav class="navbar navbar-inverse navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-nav-demo" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a href="index.html" class="navbar-brand">
        <div class="orange"><i class="fas fa-football-ball"></i> Fantasy</div>
      </a>
    </div>
    <div class="collapse navbar-collapse" id="bs-nav-demo">
      <ul class="nav navbar-nav">
        <li><a class="active" href="index.html">Home</a></li>
        <li><a href="history.html">History</a></li>
        <li><a href="picks.html">Picks & Busts of the Week</a></li>
        <li><a href="news.html">Important Dates/Announcements</a></li>
        <li><a href="blog.html">Chat/Blog</a></li>
      </ul>
    </div>
  </div>
</nav>

Answer 1

如果你使用的是 bootstrap，试试这个

<nav class="navbar navbar-expand-md 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>

Answer 2

It does appear, but clicking on it does not bring any options up

问题可能主要是由于您没有正确加载所需的 JavaScript 文件。你可以通过 documentation 获取 CDN。不要忘记添加 Jquery CDN，因为您使用的是 3.3.7 版本并且文档中没有正确提及它。 .将这些 script 标签添加到您的 HTML

<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>

<!--Latest Jquery CDN-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

这是一个工作示例。

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<nav class="navbar navbar-inverse navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-nav-demo" aria-expanded="false">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
      <a href="index.html" class="navbar-brand">
        <div class="orange"><i class="fas fa-football-ball"></i> Fantasy</div>
      </a>
    </div>
    <div class="collapse navbar-collapse" id="bs-nav-demo">
      <ul class="nav navbar-nav">
        <li><a class="active" href="index.html">Home</a></li>
        <li><a href="history.html">History</a></li>
        <li><a href="picks.html">Picks & Busts of the Week</a></li>
        <li><a href="news.html">Important Dates/Announcements</a></li>
        <li><a href="blog.html">Chat/Blog</a></li>
      </ul>
    </div>
  </div>
</nav>
<!--Latest Jquery CDN -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>

导航栏在 bootstrap 3.3.7 中没有折叠

Navbar is not collapsing in bootstrap 3.3.7

html

nav