Bootstrap navbar-btn类的用法
将.navbar-btn类的按钮添加到不位于<form>中的<button>元素中，以将其垂直放置在导航栏中。.navbar-btn可以用于<a>和<input>元素。
您可以尝试运行以下代码来实现navbar-btn类
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>
<nav class = "navbar navbar-default" role = "navigation" style="background: #85C1E9;">
<div class = "navbar-header">
<a class = "navbar-brand" href = "#">Search below:</a>
</div>
<div>
<form class = "navbar-form navbar-left" role = "search">
<div class = "form-group">
<input type = "text" class = "form-control" placeholder = "Search">
</div>
<button type = "submit" class = "btn btn-default">Submit Button</button>
</form>
<button type = "button" class = "btn btn-default navbar-btn">Navbar Button</button>
</div>
</nav>
</body>
</html>