如何使用移动设备的引导程序使我的导航栏可折叠？答案

【问题标题】：How do I make my nav bar collapsible with bootstrap for mobile devices?如何使用移动设备的引导程序使我的导航栏可折叠？
【发布时间】：2021-04-10 01:02:17
【问题描述】：

如何使用移动设备的引导程序使我的导航栏可折叠？我试过直接从引导网站使用代码，但它要么让我的导航栏完全消失，要么就是不起作用。任何帮助，将不胜感激。下面是我当前的导航栏。

    <!-- Start Navigation -->
    <nav>
        <ul class="nav justify-content-center">
            <li class="nav-item">
                <a class="nav-link active" href="index.html">Home</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="tarmac.html">Tarmac</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="paving.html">Paving</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Contact</a>
            </li>
        </ul>
    </nav>
    <!-- End Navigation  -->

【问题讨论】：

标签： bootstrap-4 navbar

【解决方案1】：

你使用 Navs 组件，你必须使用 Bootstrap 中的 Navbar 组件：https://getbootstrap.com/docs/4.0/components/navbar/

然后您可以复制/粘贴导航栏组件中的代码并对其进行修改以制作您的导航栏，如下所示：

    <!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://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

        <title>Hello, world!</title>
      </head>
      <body>
          <!-- Start Navigation -->
       <nav class="navbar navbar-expand-lg navbar-light bg-light">
      <a class="navbar-brand" href="#">Navbar</a>
      <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>

      <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <ul class="navbar-nav mr-auto">
          <li class="nav-item active">
            <a class="nav-link" href="index.html">Home <span class="sr-only">(current)</span></a>
          </li>
<li class="nav-item">
            <a class="nav-link" href="tarmac.html">Tarmac</a>
          </li>
<li class="nav-item">
            <a class="nav-link" href="paving.html">Paving</a>
          </li>
<li class="nav-item">
            <a class="nav-link" href="#">Contact</a>
          </li>
        </ul>
      </div>
    </nav>
        <!-- End Navigation  -->

        <!-- Optional JavaScript -->
        <!-- jQuery first, then Popper.js, then Bootstrap JS -->
        <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
      </body>
    </html>

【讨论】：

【解决方案2】：

正如您在Bootstrap docs 中看到的...

"导航栏需要一个包装的 .navbar .navbar-expand{-sm|-md|-lg|-xl|-xxl} 用于响应式折叠"

所以请遵循响应式导航栏指导in the docs..

<nav class="navbar navbar-expand-lg navbar-light bg-light">
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarToggler" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarToggler">
        <ul class="nav justify-content-center">
            <li class="nav-item">
                <a class="nav-link active" href="index.html">Home</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="tarmac.html">Tarmac</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="paving.html">Paving</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Contact</a>
            </li>
        </ul>
    </div>
</nav>

【讨论】：