BootStrap笔记-导航
运行截图如下：
源码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>CN_TEST1</title>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- bootstrap css核心文件-->
<link rel="stylesheet" href="bootstrap-4.4.1-dist/css/bootstrap.min.css">
<!-- bootstrap使用到了jquery，需要提前引用-->
<script src="js/jquery-3.5.1.min.js"></script>
<!-- 弹窗、提示、下拉菜单-->
<script src="bootstrap-4.4.1-dist/js/bootstrap.bundle.js"></script>
<!-- bootstrap核心文件-->
<script src="bootstrap-4.4.1-dist/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container-fluid">
<ul class="nav">
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Link</a>
</li>
</ul>
<ul class="nav justify-content-center">
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Link</a>
</li>
</ul>
<ul class="nav justify-content-end">
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Link</a>
</li>
</ul>
<ul class="nav flex-column">
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Link</a>
</li>
</ul>
<!-- 左列的-->
<ul class="nav flex-column">
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Link</a>
</li>
</ul>
<!-- 选项卡-->
<ul class="nav nav-tabs">
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Link</a>
</li>
</ul>
<!-- 胶囊导航-->
<ul class="nav nav-pills">
<li class="nav-item">
<a class="nav-link active" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Link</a>
</li>
</ul>
<!-- 胶囊下拉菜单-->
<ul class="nav nav-pills">
<li class="nav-item">
<a class="nav-link active" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Dropdown</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Link 1</a>
<a class="dropdown-item" href="#">Link 2</a>
<a class="dropdown-item" href="#">Link 3</a>
</div>
</li>
</ul>
<!-- 选项卡-->
<ul class="nav nav-tabs">
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Dropdown</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Link 1</a>
<a class="dropdown-item" href="#">Link 2</a>
<a class="dropdown-item" href="#">Link 3</a>
</div>
</li>
</ul>
<!-- 动态选项卡-->
<ul class="nav nav-tabs">
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Link</a>
</li>
<div class="tab-content">
<div class="tab-pane active container" id="home">...</div>
<div class="tab-pane container" id="menu">...</div>
<div class="tab-pane container" id="menu2">...</div>
</div>
</ul>
<ul class="nav nav-pills">
<li class="nav-item">
<a class="nav-link active" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Dropdown</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Link 1</a>
<a class="dropdown-item" href="#">Link 2</a>
<a class="dropdown-item" href="#">Link 3</a>
</div>
</li>
</ul>
</div>
</body>
</html>解释：
①在ul元素上添加nav类，li上添加nav-item就可以实现导航的功能；
②ul上添加nav类后还可以添加justify-content-center和justify-content-end，设置导航为居中和右对齐；
③flex-column用于创建垂直导航；
④ul上添加nav类后，再添加nav-tabs就是选项卡了，可以使用li中可以添加active作为选中。
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原文链接 : https://it1995.blog.csdn.net/article/details/122660779
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