要在Bootstrap中创建一个小按钮，请使用.btn-sm类。
您可以尝试运行以下代码来实现btn-sm类
<!DOCTYPE html> <html> <head> <title>Bootstrap Example</title> <meta name = "viewport" content = "width=device-width, initial-scale = 1"> <link rel = "stylesheet" href="https://stackpath.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://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> </head> <body> <button type = "button" class = "btn btn-default btn-sm"> Small button </button> <button type = "button" class = "btn btn-default btn-sm"> Result </button> </body> </html>