使用flex-*-column-reverse类可以在不同的屏幕尺寸上垂直显示和反转显示弹性项目。
这是使用“ flex-md-column-reverse”类在媒体设备上反转flex项目的示例-
<div class="d-flex flex-md-column-reverse mb-3"> <div class="p-2 bg-warning">One</div> <div class="p-2 bg-danger">Two</div> <div class="p-2 bg-secondary">Three</div> </div>
以相同的方式，使用“ flex-lg-column-reverse”类为大型设备设置-
<div class="d-flex flex-lg-column-reverse mb-3"> <div class="p-2 bg-warning">One</div> <div class="p-2 bg-danger">Two</div> <div class="p-2 bg-secondary">Three</div> </div>
实现.flex- * column-reverse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 mt-3"> <h2>Example</h2> <p>Change the browser size to see the effect:<p> <p>Default </p> <div class="d-flex flex-column"> <div class="p-2 bg-primary">One</div> <div class="p-2 bg-secondary">Two</div> <div class="p-2 bg-info">Three</div> </div> <p>Flex on differet screen size (Medium-Reverse)</p> <div class="d-flex flex-md-column-reverse mb-3"> <div class="p-2 bg-warning">One</div> <div class="p-2 bg-danger">Two</div> <div class="p-2 bg-secondary">Three</div> </div> <p>Flex on different screen size (Large-Reverse)</p> <div class="d-flex flex-lg-column-reverse mb-3"> <div class="p-2 bg-warning">One</div> <div class="p-2 bg-danger">Two</div> <div class="p-2 bg-secondary">Three</div> </div> </div> </body> </html>