Javascript 折叠导航栏未从引导中打开
当窗口缩小时，我的导航栏会折叠，但单击它不会将其打开。我有汉堡图标，但没有反应。我的代码粘贴在下面。有人能告诉我如何打开折叠的导航栏吗Javascript 折叠导航栏未从引导中打开,javascript,html,css,bootstrap-4,Javascript,Html,Css,Bootstrap 4,当窗口缩小时，我的导航栏会折叠，但单击它不会将其打开。我有汉堡图标，但没有反应。我的代码粘贴在下面。有人能告诉我如何打开折叠的导航栏吗 <html lang="en"> <head> <!-- Required meta tags --> <meta charset="utf-8"> <meta name="viewport" content="
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/js/bootstrap.bundle.min.js" integrity="sha384-JEW9xMcG8R+pH31jmWH6WWP0WintQrMb4s7ZOdauHnUtxwoG2vI5DkLtS3qm9Ekf" crossorigin="anonymous"></script>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6" crossorigin="anonymous">
<title>TITLE</title>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-primary" style="background-color: #e3f2fd;">
<a class="navbar-brand" href="#">Project</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavAltMarkup" >
<div class="navbar-nav">
<a class="nav-item nav-link active " href="#">Home</a>
<a class="nav-item nav-link " href="">About</a>
<a class="nav-item nav-link " href="">Contact</a>
<a class="nav-item nav-link " href="">Blog</a>
<a class="nav-item nav-link " href="">White Paper</a>
</div>
</div>
</nav>
标题
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搜寻
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<title>TITLE</title>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-primary" style="background-color: #e3f2fd;">
<a class="navbar-brand" href="#">Project</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavAltMarkup" >
<div class="navbar-nav">
<a class="nav-item nav-link active " href="#">Home</a>
<a class="nav-item nav-link " href="">About</a>
<a class="nav-item nav-link " href="">Contact</a>
<a class="nav-item nav-link " href="">Blog</a>
<a class="nav-item nav-link " href="">White Paper</a>
</div>
</div>
</nav>
<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>
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另外，请看我在
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