为什么我的导航栏切换器默认显示导航栏项目答案

【问题标题】：Why my navbar-toggler show the navbar-item on default为什么我的导航栏切换器默认显示导航栏项目
【发布时间】：2021-11-07 16:18:59
【问题描述】：

我想知道为什么每次我在移动视图中刷新页面时导航项都会显示。我检查了 aria-expanded: false 但它仍然不起作用。

这是我的代码：

<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-F3w7mX95PdgyTmZZMECAngseQB83DfGTowi0iMjiWaeVhAn4FJkqJByhZMI3AhiU" crossorigin="anonymous">
    <link rel="stylesheet" href="style.css">
    <title>Portfolio</title>
  </head>
  <body>
    <header>
      <nav class="navbar navbar-expand-lg fixed-top navbar-light">
        <div class="container-fluid justify-content-between mx-5 px-4">
          <a class="navbar-brand" href="#">HELLO</a>
          <button
            class="navbar-toggler collapse collapsed"
            type="button"
            data-bs-toggle="collapse"
            data-bs-target="#navbarCollapse"
            aria-controls="navbarTogglerDemo02"
            aria-expanded="false"
            aria-label="Toggle navigation">

            <span class="navbar-toggler-icon"></span>
          </button>

          <div class="navbar-collapse" id="navbarCollapse">
            <ul class="navbar-nav ms-auto">
              <li class="navbar-item">
                <a class="nav-link active " aria-current="page" href="#">ABOUT</a>
              </li>
              <li class="navbar-item">
                <a class="nav-link active" aria-current="page"href="#">PROJECT</a>
              </li class="navbar-item">
              <li class="navbar-item">
                <a class="nav-link active" aria-current="page" href="#">RESUME</a>
              </li>
              <li class="navbar-item">
                <a class="nav-link active" aria-current="page" href="#">CONTACT</a>
              </li>
            </ul>
          </div>
        </div>

      </nav>
      <!-- <img class="img-fluid" src="img\heading-image.jpg" alt=""> -->
    </header>
    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-/bQdsTh/da6pkI1MST/rWKFNjaCP5gBSY4sEBT38Q/9RBh9AH40zEOg7Hlq2THRZ" crossorigin="anonymous"></script>
    <script src="script.js"></script>
  </body>
</html>

请注意：我还是 bootstrap、html 和 css 的初学者。

【问题讨论】：

标签： html css navbar bootstrap-5

【解决方案1】：

从按钮中删除类collapse collapsed并将collapse添加到菜单div

这是完整的代码

<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-F3w7mX95PdgyTmZZMECAngseQB83DfGTowi0iMjiWaeVhAn4FJkqJByhZMI3AhiU" crossorigin="anonymous">
    
     
     
    <link rel="stylesheet" href="style.css">
    <title>Portfolio</title>
  </head>
  <body>
    <header>
      <nav class="navbar navbar-expand-lg fixed-top navbar-light"
          <a class="navbar-brand" href="#">HELLO</a>
         
          <button
            class="navbar-toggler "
            type="button"
            data-bs-toggle="collapse"
            data-bs-target="#navbarCollapse"
            aria-controls="navbarCollapse"
            aria-expanded="false"
            aria-label="Toggle navigation">

            <span class="navbar-toggler-icon"></span>
          </button>

          <div class="navbar-collapse collapse " id="navbarCollapse">
            <ul class="navbar-nav ms-auto">
              <li class="navbar-item">
                <a class="nav-link active " aria-current="page" href="#">ABOUT</a>
              </li>
              <li class="navbar-item">
                <a class="nav-link active" aria-current="page"href="#">PROJECT</a>
              <li class="navbar-item">
              <li class="navbar-item">
                <a class="nav-link active" aria-current="page" href="#">RESUME</a>
              </li>
              <li class="navbar-item">
                <a class="nav-link active" aria-current="page" href="#">CONTACT</a>
              </li>
            </ul>
        </div>

      </nav>
      <!-- <img class="img-fluid" src="img\heading-image.jpg" alt=""> -->
    </header>
    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
   <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-/bQdsTh/da6pkI1MST/rWKFNjaCP5gBSY4sEBT38Q/9RBh9AH40zEOg7Hlq2THRZ" crossorigin="anonymous"></script> 
    <script src="script.js"></script>
  </body>
</html>

【讨论】：

谢谢！它在 sn-p 上运行良好，但是当我复制到我的文件时，发生了相同的结果。我正在通过 chrome 运行文件。
尝试在标题中添加引导脚本文件而不是在正文底部添加
谢谢！但不知何故，我通过我的javascript修复了它。我错放了通过 javascript 显示项目的代码。当我从javascript中删除代码时，它解决了问题