要在Bootstrap中设置关闭图标，请使用.close类。
您可以尝试运行以下代码来设置关闭图标-
<!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 style = "width:600px;background-color:orange;"> <span>Here's the close icon</span> <button type = "button" class = "close"><span aria-hidden = "true">&times;</span> <span class = "sr-only"> Close icon </span> </button> </div> </body> </html>