导航栏折叠菜单不起作用答案

【问题标题】：Navbar collapse menu not working导航栏折叠菜单不起作用
【发布时间】：2018-12-14 13:08:50
【问题描述】：

我看到这个问题在这里问了很多，但我的代码似乎是正确的。我的数据目标 id 与折叠 div 的 id 匹配。不知道为什么当我点击汉堡图标时菜单没有打开。

<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
    <div class="container">
      <a href="index.html" class="navbar-brand">LoopLab</a>
      <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarCollapse">
        <span class="navbar-toggler-icon"></span>
      </button>
      <div id="navbarCollapse" class="collapse navbar-collapse">
        <ul class="navbar-nav ml-auto">
          <li class="nav-item">
            <a href="#home" class="nav-link">Home</a>
          </li>
          <li class="nav-item">
            <a href="#explore-head-section" class="nav-link">Explore</a>
          </li>
          <li class="nav-item">
            <a href="#create-head-section" class="nav-link">Create</a>
          </li>
          <li class="nav-item">
            <a href="#share-head-section" class="nav-link">Share</a>
          </li>
        </ul>
      </div>
    </div>
  </nav>

【问题讨论】：

标签： twitter-bootstrap navbar collapse

【解决方案1】：

当我将您的代码与 Bootstrap 4 模板一起使用时，它似乎有效。确保为 Bootstrap 正确加载 JS 和 CSS。使用小窗口查看汉堡菜单图标。

<!doctype html>
<html lang="en">

<head>
  <!-- Required meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB" crossorigin="anonymous">

  <title>Hello, world!</title>
</head>

<body>
  <nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
    <div class="container">
      <a href="index.html" class="navbar-brand">LoopLab</a>
      <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarToggleExternalContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>
      <div id="navbarCollapse" class="collapse navbar-collapse">
        <ul class="navbar-nav ml-auto">
          <li class="nav-item">
            <a href="#home" class="nav-link">Home</a>
          </li>
          <li class="nav-item">
            <a href="#explore-head-section" class="nav-link">Explore</a>
          </li>
          <li class="nav-item">
            <a href="#create-head-section" class="nav-link">Create</a>
          </li>
          <li class="nav-item">
            <a href="#share-head-section" class="nav-link">Share</a>
          </li>
        </ul>
      </div>
    </div>
  </nav>



  <h1>Hello, world!</h1>

  <!-- Optional JavaScript -->
  <!-- jQuery first, then Popper.js, then Bootstrap JS -->
  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js" integrity="sha384-smHYKdLADwkXOn1EmN1qk/HfnUcbVRZyYmZ4qpPea6sjB/pTJ0euyQp0Mk8ck+5T" crossorigin="anonymous"></script>
</body>

</html>

【讨论】：

【解决方案2】：

对于项目 Angular：

确保angular.json 文件中有bootstrap.css、jquery.js 和bootstrap.js 文件。

示例：

"styles": [
          "node_modules/bootstrap/dist/css/bootstrap.css",
          "src/styles.scss"
        ],
"scripts": [
          "node_modules/jquery/dist/jquery.min.js",
          "node_modules/bootstrap/dist/js/bootstrap.js"
        ]

【讨论】：

添加：“node_modules/bootstrap/dist/js/bootstrap.bundle.js”