要在Bootstrap中创建一个指示危险的按钮，请使用.btn-danger类。
您可以尝试运行以下代码来实现。btn-危险等级-
<!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://cdn.staticfile.org/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> <p>Cick the below button in case of issues:</p> <div class = "container"> <button type = "button" class="btn btn-danger">Danger</button> </div> </body> </html>