创建解雇警报-
通过创建包装器<div>并添加.alert类和四个上下文类之一来添加基本警报，例如.alert-success，.alert-info等。
还要在上述<div>类中添加可选的.alert-dismissable。
添加一个关闭按钮。
您可以尝试运行以下代码来创建解雇警报-
<!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 = "alert alert-success alert-dismissable"> <button type = "button" class = "close" data-dismiss = "alert" aria-hidden = "true"> × </button> Success! Well done its submitted. </div> <div class = "alert alert-info alert-dismissable"> <button type = "button" class = "close" data-dismiss = "alert" aria-hidden = "true"> × </button> Info! Take this info. </div> </body> </html>