使用Bootstrap指示选项卡式菜单
要设置选项卡式菜单，请在Bootstrap中使用.navnav-tabs类-
示例
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<link rel = "stylesheet" href = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src = "https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script>
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class = "container">
<h2>Web Development</h2>
<p>The following are the web dev technologies:</p>
<ul class = "nav nav-tabs" role = "tablist">
<li class = "active"><a href = "#">HTML5</a></li>
<li><a href = "#">jQuery</a></li>
<li><a href = "#">JavaScript</a></li>
<li><a href = "#">CSS</a></li>
<li><a href = "#">Ajax</a></li>
<li><a href = "#">ES6</a></li>
</ul>
</div>
</body>
</html>