Bootstrap 可折叠导航栏未在移动设备的下拉菜单中显示菜单

Question

我尝试为移动设备创建一个可折叠的导航栏，尽管我使用的是 Bootstrap 3.3.6 旧版本，因为我正在做一些事情。按钮出现了，但是当我点击它时没有任何反应，它不显示下拉菜单。我什至从 3.3.6 版本的 Bootstrap 组件中复制粘贴了一些代码，在 bootstrap 网站上它可以工作，但是当我在我的 html 代码中尝试相同的代码时它根本不起作用.不确定这里到底发生了什么这是代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>A Site</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
    <link rel="stylesheet" href="css/styles.css">
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Square+Peg&display=swap" rel="stylesheet">
</head>
<body>
    <script src="js/jquery-3.6.0.min.js"></script>
    <script src="js/bootstrap.min.js"></script>

    <header>
        <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" role="search">
                  <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>
    </header>
</body>

这是我的代码笔link：https://codepen.io/MrROBOT_10/pen/gOoyyLe

这是 Bootstrap 个组件 link：https://bootstrapdocs.com/v3.3.6/docs/components/#navbar

Answer 1

在代码笔中它说 jquery 在代码笔控制台中不可用。所以我添加了

     <script
  src="https://code.jquery.com/jquery-2.2.4.js"
  integrity="sha256-iT6Q9iMJYuQiMWNd9lDyBUStIq/8PuOW33aOqmvFpqI="
  crossorigin="anonymous"></script>

就在最后的 body 标签之前让它工作

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