单击切换器后，Bootstrap 4 导航未扩展 [重复]
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【中文标题】单击切换器后，Bootstrap 4 导航未扩展 [重复]【英文标题】：Bootstrap 4 nav not expanding after clicking the toggler [duplicate] 【发布时间】：2018-10-21 23:40:36 【问题描述】：所以，我在 Bootstrap 4 中制作了一个导航栏。但由于某种原因，当我的导航栏折叠（使用较小的屏幕/窗口时）并且我单击应该再次展开它的按钮时，什么也没有发生。导航栏不可见。另外，我将“navbar-toggler-right”类放在按钮上，但由于某种原因它不在右侧。
我的代码：
<html>
<head>
<meta charset="utf-8">
<title>Admin</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" integrity="sha384-9gVQ4dYFwwWSjIDZnLEWnxCjeSWFphJiwGPXr1jddIhOegiu1FwO5qRGvFXOdJZ4" crossorigin="anonymous">
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js" integrity="sha384-uefMccjFJAIv6A+rW+L4AHf99KvxDjWSu1z9VI8SKNVmz4sk7buKt/6v9KI65qnm" crossorigin="anonymous"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js" integrity="sha384-cs/chFZiN24E4KMATLdqdvsezGxaGsi4hLGOzlXwp5UZB1LY//20VyM2taTB4QvJ" crossorigin="anonymous"></script>
<link
rel="stylesheet"
href="https://fonts.googleapis.com/icon?family=Material+Icons">
</head>
<body>
<nav class="navbar navbar-light navbar-expand-lg">
<button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavDropdown">
<span class="navbar-toggler-icon"></span>
</button>
<div id="navbarNavDropdown" class="collapse navbar-collapse" >
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#Pricing">Pricing</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#About">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#FAQ">FAQ</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#Blog">Blog</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#Contact">Contact</a>
</li>
</ul>
</div>
</nav>
</body>
</html>
【问题讨论】：
【参考方案1】：只需将jquery-3.3.1.slim.min.js 放在bootstrap.min.js 之前
<html>
<head>
<meta charset="utf-8">
<title>Admin</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" integrity="sha384-9gVQ4dYFwwWSjIDZnLEWnxCjeSWFphJiwGPXr1jddIhOegiu1FwO5qRGvFXOdJZ4" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js" integrity="sha384-uefMccjFJAIv6A+rW+L4AHf99KvxDjWSu1z9VI8SKNVmz4sk7buKt/6v9KI65qnm" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js" integrity="sha384-cs/chFZiN24E4KMATLdqdvsezGxaGsi4hLGOzlXwp5UZB1LY//20VyM2taTB4QvJ" crossorigin="anonymous"></script>
<link
rel="stylesheet"
href="https://fonts.googleapis.com/icon?family=Material+Icons">
</head>
<body>
<nav class="navbar navbar-light navbar-expand-lg">
<div class="container">
<button class="navbar-toggler ml-auto" data-toggle="collapse" data-target="#navbarNavDropdown">
<span class="navbar-toggler-icon"></span>
</button>
<div id="navbarNavDropdown" class="collapse navbar-collapse" >
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#Pricing">Pricing</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#About">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#FAQ">FAQ</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#Blog">Blog</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#Contact">Contact</a>
</li>
</ul>
</div>
</div>
</nav>
</body>
</html>【讨论】：
【参考方案2】：你需要在引导脚本之前设置jquery
像这样
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" integrity="sha384-9gVQ4dYFwwWSjIDZnLEWnxCjeSWFphJiwGPXr1jddIhOegiu1FwO5qRGvFXOdJZ4" crossorigin="anonymous">
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js" integrity="sha384-uefMccjFJAIv6A+rW+L4AHf99KvxDjWSu1z9VI8SKNVmz4sk7buKt/6v9KI65qnm" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js" integrity="sha384-cs/chFZiN24E4KMATLdqdvsezGxaGsi4hLGOzlXwp5UZB1LY//20VyM2taTB4QvJ" crossorigin="anonymous"></script>
【讨论】：
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