要针对不同的屏幕尺寸（例如大，小，中等）水平设置flex项目，请使用flex-*-row类。
让我们看看哪个flex-*-row类用于不同的屏幕尺寸-
Small Screen Size: flex-sm-rowMedium Screen Size: flex-md-rowLarge Screen Size: flex-lg-row
以下是为小屏幕尺寸水平设置弹性项目的示例-
<div class="d-sm-flex flex-sm-row bg-primary mb-3"> <div class="p-2 bg-primary">Audi</div> <div class="p-2 bg-warning">BMW</div> <div class="p-2 bg-secondary">Benz</div> </div>
您可以尝试运行以下代码以在Bootstrap 4中实现.flex-*-row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>Flex</h2> <p>Resize the browser window to check the effect.</p> <h2>Flex Row</h2> <div class="d-flex flex-row bg-primary mb-3"> <div class="p-2 bg-secondary">Audi</div> <div class="p-2 bg-warning">BMW</div> <div class="p-2 bg-info">Benz</div> </div> <h2>Flex Row (Small Screen)</h2> <div class="d-sm-flex flex-sm-row bg-primary mb-3"> <div class="p-2 bg-primary">Audi</div> <div class="p-2 bg-warning">BMW</div> <div class="p-2 bg-secondary">Benz</div> </div> <h2>Flex Row (Medium Screen)</h2> <div class="d-md-flex flex-md-row bg-primary mb-3"> <div class="p-2 bg-warning">Audi</div> <div class="p-2 bg-danger">BMW</div> <div class="p-2 bg-primary">Benz</div> </div> <h2>Flex Row (Large Screen)</h2> <div class="d-lg-flex flex-lg-row bg-primary mb-3"> <div class="p-2 bg-primary">Audi</div> <div class="p-2 bg-danger">BMW</div> <div class="p-2 bg-info">Benz</div> </div> </div> </body> </html>