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
<!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>