要在下拉菜单中添加标题，请使用Boostrap中的.dropdown-header类。.dropdown-menu类用于添加下拉菜单。
您可以尝试运行以下代码以在Bootstrap中实现dropdown-header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> <div class = "container"> <h2>Beverages</h2> <p>The following are the beverages available in India:</p> <div class = "dropdown"> <button class = "btn btn-primary dropdown-toggle" type = "button" data-toggle="dropdown">Beverages <span class = "caret"></span></button> <ul class = "dropdown-menu"> <li class = "dropdown-header">Energy Drinks</li> <li><a href = "#">Gatorade</a></li> <li><a href = "#">Sting</a></li> <li><a href = "#">Red Bull</a></li> <li class = "dropdown-header">Sof Drinks</li> <li><a href = "#">Pepsi</a></li> <li><a href = "#">Coca Cola</a></li> </ul> </div> </div> </body> </html>