要设置Bootstrap模态的页脚，请使用.modal-footer类。
您可以尝试运行以下代码来实现modal-footer类-
<!DOCTYPE html> <html> <head> <title>Bootstrap Example</title> <link rel = "stylesheet" href = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/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/3.3.7/js/bootstrap.min.js"></script> </head> <body> <div class = "container"> <h2>Examination</h2> <button type = "button" class = "btn btn-lg" data-toggle="modal" data-target="#new">Result</button> <div class = "modal fade" id = "new" role = "dialog"> <div class = "modal-dialog"> <div class = "modal-content"> <div class = "modal-header"> <button type = "button" class = "close" data-dismiss = "modal">×</button> <h4 class = "modal-title">Warning</h4> </div> <div class = "modal-body"> <p>If JavaScript isn't enabled in your web browser, then you may not be able to see the result.</p> </div> <div class = "modal-footer"> <button type="button" class="btn btn-primary" data-dismiss="modal">Close</button> </div> </div> </div> </div> </div> </body> </html>