Bootstrap Navbar 汉堡包在单击时不会折叠

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【中文标题】Bootstrap Navbar 汉堡包在单击时不会折叠【英文标题】：Bootstrap Navbar hamburger does not collapse when clicked 【发布时间】：2020-08-06 20:26:30 【问题描述】：

我正在学习视频课程，并且完全按照讲师的方式进行操作。他的导航栏汉堡包在点击时会塌陷，但我的没有。 我试过了： 不同的浏览器 重新排列 JQuery 和引导程序的链接和脚本标签的顺序和位置 查看引导 css 文件以查看是否有禁用的类属性

有人可以帮我解释一下为什么汉堡按钮不折叠吗？

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <title>Bootstrap Navbars</title>

    <link
      rel="stylesheet"
      type="text/css"
      href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
      integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu"
      crossorigin="anonymous"
    />
  </head>
  <body>
    <nav class="navbar navbar-default">
      <div class="container">
        <div class="navbar-header">
          <button
            type="button"
            class="navbar-toggle collapsed"
            data-toggle="collapse"
            data-target="#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="#" class="navbar-brand">Koffee</a>
        </div>
        <div class="collapse navbar-collapse" id="demo">
          <ul class="nav navbar-nav">
            <li><a href="#">About</a></li>
            <li><a href="#">Contact</a></li>
          </ul>
          <ul class="nav navbar-nav navbar-right">
            <li><a href="#">Sign Up</a></li>
            <li><a href="#">Login</a></li>
          </ul>
        </div>
      </div>
    </nav>

    <!-- DEFAULT NAVBAR -->
    <nav class="navbar navbar-default">
      <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
          <button
            type="button"
            class="navbar-toggle collapsed"
            data-toggle="collapse"
            data-target="#bs-example-navbar-collapse-1"
            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 class="navbar-brand" href="#">Brand</a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
          <ul class="nav navbar-nav">
            <li class="active">
              <a href="#">Link <span class="sr-only">(current)</span></a>
            </li>
            <li><a href="#">Link</a></li>
            <li class="dropdown">
              <a
                href="#"
                class="dropdown-toggle"
                data-toggle="dropdown"
                role="button"
                aria-haspopup="true"
                aria-expanded="false"
                >Dropdown <span class="caret"></span
              ></a>
              <ul class="dropdown-menu">
                <li><a href="#">Action</a></li>
                <li><a href="#">Another action</a></li>
                <li><a href="#">Something else here</a></li>
                <li role="separator" class="divider"></li>
                <li><a href="#">Separated link</a></li>
                <li role="separator" class="divider"></li>
                <li><a href="#">One more separated link</a></li>
              </ul>
            </li>
          </ul>
          <form class="navbar-form navbar-left">
            <div class="form-group">
              <input type="text" class="form-control" placeholder="Search" />
            </div>
            <button type="submit" class="btn btn-default">Submit</button>
          </form>
          <ul class="nav navbar-nav navbar-right">
            <li><a href="#">Link</a></li>
            <li class="dropdown">
              <a
                href="#"
                class="dropdown-toggle"
                data-toggle="dropdown"
                role="button"
                aria-haspopup="true"
                aria-expanded="false"
                >Dropdown <span class="caret"></span
              ></a>
              <ul class="dropdown-menu">
                <li><a href="#">Action</a></li>
                <li><a href="#">Another action</a></li>
                <li><a href="#">Something else here</a></li>
                <li role="separator" class="divider"></li>
                <li><a href="#">Separated link</a></li>
              </ul>
            </li>
          </ul>
        </div>
        <!-- /.navbar-collapse -->
      </div>
      <!-- /.container-fluid -->
    </nav>
    <script
      src="https://code.jquery.com/jquery-3.5.0.js"
      integrity="sha256-r/AaFHrszJtwpe+tHyNi/XCfMxYpbsRg2Uqn0x3s2zc="
      crossorigin="anonymous"
    ></script>
    <script
      src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"
      integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd"
      crossorigin="anonymous"
    ></script>
  </body>
</html>

【问题讨论】：

【参考方案1】：

问题在于您的库。将它们更改为

<script src="https://code.jquery.com/jquery-2.2.4.min.js" integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44="   crossorigin="anonymous"></script>

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


<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <title>Bootstrap Navbars</title>

    <link
      rel="stylesheet"
      type="text/css"
      href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
      integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu"
      crossorigin="anonymous"
    />
  </head>
  <body>
    <nav class="navbar navbar-default">
      <div class="container">
        <div class="navbar-header">
          <button
            type="button"
            class="navbar-toggle collapsed"
            data-toggle="collapse"
            data-target="#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="#" class="navbar-brand">Koffee</a>
        </div>
        <div class="collapse navbar-collapse" id="demo">
          <ul class="nav navbar-nav">
            <li><a href="#">About</a></li>
            <li><a href="#">Contact</a></li>
          </ul>
          <ul class="nav navbar-nav navbar-right">
            <li><a href="#">Sign Up</a></li>
            <li><a href="#">Login</a></li>
          </ul>
        </div>
      </div>
    </nav>

    <!-- DEFAULT NAVBAR -->
    <nav class="navbar navbar-default">
      <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
          <button
            type="button"
            class="navbar-toggle collapsed"
            data-toggle="collapse"
            data-target="#bs-example-navbar-collapse-1"
            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 class="navbar-brand" href="#">Brand</a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
          <ul class="nav navbar-nav">
            <li class="active">
              <a href="#">Link <span class="sr-only">(current)</span></a>
            </li>
            <li><a href="#">Link</a></li>
            <li class="dropdown">
              <a
                href="#"
                class="dropdown-toggle"
                data-toggle="dropdown"
                role="button"
                aria-haspopup="true"
                aria-expanded="false"
                >Dropdown <span class="caret"></span
              ></a>
              <ul class="dropdown-menu">
                <li><a href="#">Action</a></li>
                <li><a href="#">Another action</a></li>
                <li><a href="#">Something else here</a></li>
                <li role="separator" class="divider"></li>
                <li><a href="#">Separated link</a></li>
                <li role="separator" class="divider"></li>
                <li><a href="#">One more separated link</a></li>
              </ul>
            </li>
          </ul>
          <form class="navbar-form navbar-left">
            <div class="form-group">
              <input type="text" class="form-control" placeholder="Search" />
            </div>
            <button type="submit" class="btn btn-default">Submit</button>
          </form>
          <ul class="nav navbar-nav navbar-right">
            <li><a href="#">Link</a></li>
            <li class="dropdown">
              <a
                href="#"
                class="dropdown-toggle"
                data-toggle="dropdown"
                role="button"
                aria-haspopup="true"
                aria-expanded="false"
                >Dropdown <span class="caret"></span
              ></a>
              <ul class="dropdown-menu">
                <li><a href="#">Action</a></li>
                <li><a href="#">Another action</a></li>
                <li><a href="#">Something else here</a></li>
                <li role="separator" class="divider"></li>
                <li><a href="#">Separated link</a></li>
              </ul>
            </li>
          </ul>
        </div>
        <!-- /.navbar-collapse -->
      </div>
      <!-- /.container-fluid -->
    </nav>
   <script src="https://code.jquery.com/jquery-2.2.4.min.js" integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44="   crossorigin="anonymous"></script>

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

【讨论】：

这对 Cagri 有效，非常感谢。我能问一下为什么需要使用旧版本的库吗？ 这与旧版本或新版本无关。用于 jquery 的版本 u 不包括开放代码的代码。例如你可以用&lt;script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"&gt;&lt;/script&gt;改变jquery，它会再次工作。 我不明白你说“不包括开放代码的代码”是什么意思将我引导到一个我可以研究更多的领域以了解这方面的信息，以免将来发生？ 我的意思是一些 jquery 版本与 boottsrap 版本不匹配以使用所有 bootsrap 功能。如果你集成了错误的组合，那么一些 bootsrap 功能将无法工作 getbootstrap.com/docs/4.2/getting-started/introduction 在 bootsrap 网站中，您总是可以找到正常工作的组合。

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