使用 Bootstrap 创建警告消息框
在 Bootstrap 中使用 .alert 类创建警报消息框 −
示例
<!DOCTYPE html> <html> <head> <title>Bootstrap Example</title> <link rel = "stylesheet" href = "https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css"> <script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> </head> <body> <div class = "container"> <div class = "alert alert-warning"> <p>Warning!</p> </div> </div> </body> </html>
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