bootstrap 导航条下拉菜单点击无反应？
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="css/bootstrap.min.css" th:href="@{webjars/bootstrap/4.4.1/css/bootstrap.min.css}">
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script type="text/javascript" src="js/jquery-3.4.1.min.js" th:src="@{js/jquery-3.4.1.min.js}"></script>
<script type="text/javascript" src="js/popper.min.js" th:src="@{js/popper.min.js}"></script>
<script type="text/javascript" src="js/bootstrap.min.js" th:src="@{js/bootstrap.min.js}"></script>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-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 active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Pricing</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown link
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
</ul>
</div>
</nav>
</body>
</html> 展开
第一步:梳理js的加载顺序
<!-- jquery -->
<script src="https://cdn.bootcss.com/jquery/2.2.4/jquery.min.js"></script>
<!-- bootstrap -->
<script src="https://cdn.bootcss.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin="anonymous"></script>
<!-- 用于弹窗、提示、下拉菜单 -->
<script src="https://cdn.bootcss.com/popper.js/1.12.9/umd/popper.min.js"
integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin="anonymous"></script>
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还没有解决的话,继续第二步:初始化下拉菜单,页面加入以下js代码
<script type="text/javascript">
$(function () {
// 解决bootstrap下拉菜单第一次点击无反应问题
$('.dropdown-toggle').dropdown();
});
</script>
原文链接：https://blog.csdn.net/qq_28988969/article/details/87881481
