要创建列表组标题，请在Bootstrap中使用.list-group-item-heading 类。
您可以尝试运行以下代码来实现.list-group-item-heading类-
<!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 class = "container"> <h1>Countries</h1> <ul class = "list-group"> <li class = "list-group-item"> <h3 class = "list-group-item-heading">Asia</h3> <p class = "list-group-item-text">India</p> <p class = "list-group-item-text">Nepal</p> </li> <li class = "list-group-item"> <h3 class = "list-group-item-heading">Europe</h3> <p class = "list-group-item-text">Germany</p> <p class = "list-group-item-text">Italy</p> <p class = "list-group-item-text">Spain</p> </li> </ul> </div> </body> </html>