下拉项和汉堡包无法 collapsing/not 正常工作，即使它们调整大小也很好

Question

我目前正开始使用 Bootstrap 学习 Web 开发，目前我一直在使用导航栏，特别是 dropdown/collapse 功能这似乎不适用于下拉项和汉堡包图标。

我已经尝试加载最新的脚本（在 BS 网页中找到），这在其他一些帖子中似乎有效，但不幸的是对我来说无效...

在下面找到我的代码：

<!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>Web Test #2</title>
    <!-- Bootstrap -->
    <link href="style.css" rel="stylesheet" type="text/css">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">


  </head>
  <body>
    <!-- body code goes here -->
    <div id="myNavbar" >
    <nav class="navbar navbar-expand-lg bg-light navbar-light sticky-top">
        <a class="navbar-brand" href="#"> Web App </a>

    <div class="collapse navbar-collapse" id="collapsibleNavbar">   
        <ul class="navbar-nav">
        <li class="nav-item active"><a class="nav-link" href="#"> Home </a></li>
        <li class="nav-item"><a class="nav-link" href="#"> About </a></li>
        <li class="nav-item"><a class="nav-link" href="#"> Products </a></li>
        <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-toogle="dropdown"> Contact us </a>
            <div class="dropdown-menu">
            <a class="dropdown-item" href="#"> Facebook </a>
            <a class="dropdown-item" href="#"> Instagram</a>
            <a class="dropdown-item" href="#"> e-mail</a>

            </div>
        </li>
        </ul>
        </div>
        <form class="form-inline">
        <input class="form-control mr-sm-2" type="text" placeholder="Search">
        <button class="btn btn-success" type="submit">Search</button>
        </form>
<!-----Colapsible button here -->
    <button class="navbar-toggler" type="button" data-toogle="collapse" data-target="#collapsibleNavbar">
    <span class="navbar-toggler-icon"></span>
    </button>           

    <!------end---> 

    </nav>  


    </div>

<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>

</body>
</html>

这些是使用的脚本，顺序如下：

<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>

Answer 1

看看这个例子。我像你一样从bootstrap中拿了一个例子（Bootstrap-Navbar）并且像你一样改变了属性。

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">

<!-- just the navbar -->
<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Web App</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="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">About</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Products</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Contact us
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Facebook</a>
          <a class="dropdown-item" href="#">Instagram</a>
          <a class="dropdown-item" href="#">E-Mail</a>

        </div>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>


<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>

hamburger 项目在这里有效，但在您的示例中，您在导航栏折叠之外有搜索字段和搜索按钮。这是故意的，您不想折叠搜索字段吗？在我的示例中，搜索字段也会折叠。

下拉项和汉堡包无法 collapsing/not 正常工作，即使它们调整大小也很好

Dropdown Item & Hamburger not collapsing/not working even if they resize well

html

collapse

hamburger-menu

dropdown

bootstrap-4