使用引导程序的多级导航菜单

Question

我们在学校的一个项目上出了点问题。我们正在尝试做一个电子商务网站和前端，我们想尝试bootstrap 4。但我们似乎不能去任何低于2级，任何建议都是欢迎的。我试着研究了不同的问题，但没有一个解决方案是有效的。

null

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">

<header>
    <div class="header-container">
        <!---Navigation menu-->
        <nav class="navbar navbar-expand-lg navbar-light bg-light">
          <a class="navbar-brand text-center" href="index.html">
            <img src="../img/Libela_Logo_Small.png" title="Libela - Elegant webshop" alt="Libela logo" width="30%" height="30%">
          </a>

          <div class="container-fluid">
            <a class="navbar-brand" href="index.html">Acceuil</a>
            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
              <span class="navbar-toggler-icon"></span>
            </button>
            <div class="collapse navbar-collapse" id="navbarNavDropdown">
              <ul class="navbar-nav">
                <li class="nav-item dropdown">
                  <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                    Boutique
                  </a>
                  <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                    <li><a class="dropdown-item" href="#">Vêtements</a></li>
<!-- i would like to add another level here -->
                    <li><a class="dropdown-item" href="#">Chaussures</a></li>
                    <li><a class="dropdown-item" href="#">Accessoires</a></li>
                    <li><a class="dropdown-item" href="#">Sacs</a></li>
                  </ul>
                </li>
                <li class="nav-item">
                  <a class="nav-link" href="#">Blog</a>
                </li>
                <li class="nav-item">
                  <a class="nav-link" href="#">Contact</a>
                </li>
                <li class="nav-item">
                  <a class="nav-link" href="#">Promotions</a>
                </li>
              </ul>
            </div>
          </div>
        </nav>
    </div> <!---end Navigation menu-->
</header>

null

Answer 1

如果下一个级别没有加载，那么在网站的另一个页面上创建该级别。（像一个更多的按钮什么的）