引导如何将导航栏放在短屏幕的下拉菜单中

我试图通过jumbotron和fix-nav-bar引导程序示例的组合来设置索引页面。

使用bootstrap的修复导航栏页面，如果缩小窗口宽度而不是导航栏列表，则可以获得包含导航栏内容的下拉菜单。就我而言，它不起作用。我不明白那里缺了什么。

尽管如此，如果我将<nav>和</nav> html标记之间的行复制到引导程序示例页面中，它就可以工作了。

这是我的index.html页面：

<!DOCTYPE html>
<html lang="en-US">
  <head><meta charset='utf-8'>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="Association M'Langues">
<link rel="icon" href="">
<title>Mon Association</title>
<!-- Bootstrap: 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">
<!-- Bootstrap: 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>
<link rel="stylesheet" href="/css/styles.css">
<!-- Begin Jekyll SEO tag v2.5.0 -->
<title>Mon Association</title>
<meta name="generator" content="Jekyll v3.7.4" />
<meta property="og:title" content="Association" />
<meta property="og:locale" content="en_US" />
<meta name="description" content="L’association" />
<meta property="og:description" content="L’association" />
<link rel="canonical" href="http://localhost:4000/index2" />
<meta property="og:url" content="http://localhost:4000/index2" />
<meta property="og:site_name" content="Association" />
<script type="application/ld+json">
{"description":"L’association .","@type":"WebPage","url":"http://localhost:4000/index2","headline":"Association","@context":"http://schema.org"}</script>
<!-- End Jekyll SEO tag -->
  </head>
  <body>
    <!-- HEADER --><!-- Fixed navbar -->
<nav class="navbar navbar-default navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Association </a>
    </div>
    <div id="navbar" class="navbar-collapse collapse">
      <ul class="nav navbar-nav navbar-right"><li class="">
            <a href="/activites/">Activités</a>
        </li>
      <li class="">
            <a href="/actualites">Actualités de l&#39;association</a>
        </li>
      <li class="">
            <a href="/contact/">Contact</a>
        </li>
      <li class="">
            <a href="/about/">À Propos</a>
        </li>
      </ul>
    </div><!--/.nav-collapse -->
  </div>
</nav>
<!-- Main jumbotron for a primary marketing message or call to action -->
<div class="jumbotron">
  <div class="container">
    <h1>Association </h1>
    <p>L'association a pour objectif la promotion .</p>
    <p><a class="btn btn-primary btn-lg" href="#" role="button">Learn more &raquo;</a></p>
  </div>
</div>
<!-- MAIN CONTENT -->
    <div class="container">
      <p>Bonjour !</p>
<p>Bienvenu sur le site de l’Association </p>

      <!-- Example row of columns -->
      <div class="row">
        <div class="col-md-4">
          <h2>Heading</h2>
          <p>Donec id elit non mi porta gravida at eget metus. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Etiam porta sem malesuada magna mollis euismod. Donec sed odio dui. </p>
          <p><a class="btn btn-default" href="#" role="button">View details &raquo;</a></p>
        </div>
        <div class="col-md-4">
          <h2>Heading</h2>
          <p>Donec id elit non mi porta gravida at eget metus. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Etiam porta sem malesuada magna mollis euismod. Donec sed odio dui. </p>
          <p><a class="btn btn-default" href="#" role="button">View details &raquo;</a></p>
       </div>
        <div class="col-md-4">
          <h2>Heading</h2>
          <p>Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Vestibulum id ligula porta felis euismod semper. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
          <p><a class="btn btn-default" href="#" role="button">View details &raquo;</a></p>
        </div>
      </div>
      <!-- FOOTER  --><footer>
    <p class="copyright">Association </p>
    <p>Published with <a href="https://pages.github.com">GitHub Pages</a></p>
</footer>
</div>


    <!-- Bootstrap core JavaScript
    ================================================== -->
    <!-- Placed at the end of the document so the pages load faster -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script>window.jQuery || document.write('<script src="../../assets/js/vendor/jquery.min.js"></script>')</script>
  </body>
</html>

Bootstrap缩小的javascript文件：

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>

应包含在JQuery缩小的javascript文件之后：

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>

所以，你的代码应该是这样的：

<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset='utf-8'>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="description" content="">
    <meta name="author" content="Association M'Langues">
    <link rel="icon" href="">    
    <title>Mon Association</title>
    <!-- Bootstrap: 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">
    <link rel="stylesheet" href="/css/styles.css">
    <!-- Begin Jekyll SEO tag v2.5.0 -->
    <title>Mon Association</title>
    <meta name="generator" content="Jekyll v3.7.4" />
    <meta property="og:title" content="Association" />
    <meta property="og:locale" content="en_US" />
    <meta name="description" content="L’association" />
    <meta property="og:description" content="L’association" />
    <link rel="canonical" href="http://localhost:4000/index2" />
    <meta property="og:url" content="http://localhost:4000/index2" />
    <meta property="og:site_name" content="Association" />
    <script type="application/ld+json">
    {"description":"L’association .","@type":"WebPage","url":"http://localhost:4000/index2","headline":"Association","@context":"http://schema.org"}</script>
    <!-- End Jekyll SEO tag -->
  </head>
  <body>
    <!-- HEADER --><!-- Fixed navbar -->
    <nav class="navbar navbar-default navbar-fixed-top">
      <div class="container">
        <div class="navbar-header">
          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a class="navbar-brand" href="#">Association </a>
        </div>
        <div id="navbar" class="navbar-collapse collapse">
          <ul class="nav navbar-nav navbar-right">
            <li class="">
              <a href="/activites/">Activités</a>
            </li>
            <li class="">
              <a href="/actualites">Actualités de l&#39;association</a>
            </li>
            <li class="">
              <a href="/contact/">Contact</a>
            </li>
            <li class="">
              <a href="/about/">À Propos</a>
            </li>
          </ul>
        </div><!--/.nav-collapse -->
      </div>
    </nav>
    <!-- Main jumbotron for a primary marketing message or call to action -->
    <div class="jumbotron">
      <div class="container">
        <h1>Association </h1>
        <p>L'association a pour objectif la promotion .</p>
        <p><a class="btn btn-primary btn-lg" href="#" role="button">Learn more &raquo;</a></p>
      </div>
    </div>
    <!-- MAIN CONTENT -->
    <div class="container">
      <p>Bonjour !</p>    
      <p>Bienvenu sur le site de l’Association </p>
      <!-- Example row of columns -->
      <div class="row">
        <div class="col-md-4">
          <h2>Heading</h2>
          <p>Donec id elit non mi porta gravida at eget metus. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Etiam porta sem malesuada magna mollis euismod. Donec sed odio dui. </p>
          <p><a class="btn btn-default" href="#" role="button">View details &raquo;</a></p>
        </div>
        <div class="col-md-4">
          <h2>Heading</h2>
          <p>Donec id elit non mi porta gravida at eget metus. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Etiam porta sem malesuada magna mollis euismod. Donec sed odio dui. </p>
          <p><a class="btn btn-default" href="#" role="button">View details &raquo;</a></p>
        </div>
        <div class="col-md-4">
          <h2>Heading</h2>
          <p>Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Vestibulum id ligula porta felis euismod semper. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
          <p><a class="btn btn-default" href="#" role="button">View details &raquo;</a></p>
        </div>
      </div>
      <!-- FOOTER  -->
      <footer>    
        <p class="copyright">Association </p>    
        <p>Published with <a href="https://pages.github.com">GitHub Pages</a></p>
      </footer>
    </div>
    <!-- Bootstrap core JavaScript
    ================================================== -->
    <!-- Placed at the end of the document so the pages load faster -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script>window.jQuery || document.write('<script src="../../assets/js/vendor/jquery.min.js"></script>')</script>
    <!-- Bootstrap: 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>
  </body>
</html>

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