创建默认的引导导航栏
在Bootstrap中按照以下给定步骤创建默认导航栏-
将.navbar，.navbar-default类添加到<nav>标记。
在上面的元素中添加role=“navigation”，以帮助辅助功能。
将头文件类.navbar-header添加到<div>元素。在navbar-brand类中包含一个<a>元素。这将使文本略大。
要将链接添加到导航栏，只需添加具有.nav，.navbar-nav类的无序列表即可。
您可以尝试运行以下代码来创建默认导航栏-
示例
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<link href = "/bootstrap/css/bootstrap.min.css" rel = "stylesheet">
<script src = "/scripts/jquery.min.js"></script>
<script src = "/bootstrap/js/bootstrap.min.js"></script>
</head>
<body style = "background: #F5CBA7;">
<nav class = "navbar navbar-default" role = "navigation">
<div class = "navbar-header">
<a class = "navbar-brand" href = "#">Cars</a>
</div>
<div>
<ul class = "nav navbar-nav">
<li class = "active"><a href = "#">BMW</a></li>
<li><a href = "#">Audi</a></li>
<li class = "dropdown">
<a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
SUV
<b class = "caret"></b>
</a>
<ul class = "dropdown-menu">
<li><a href = "#">Creta</a></li>
<li><a href = "#">Scorpio</a></li>
</ul>
</li>
</ul>
</div>
</nav>
</body>
</html>