使用card-header类创建Bootstrap卡的标题-
<div class="card-header"> This is the header </div>
包括卡头之后，您可以添加卡主体和页脚，如以下代码片段所示：
<div class="card-body"> This is demo content. </div> <div class="card-footer"> This is the footer. </div>
您可以尝试运行以下代码以在Bootstrap 4中实现card-header类-
<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/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/4.1.0/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>Demo Heading</h2> <div class="card"> <div class="card-header">This is the header</div> <div class="card-body">This is demo content.</div> <div class="card-footer">This is the footer</div> </div> </div> </body> </html>