要在不同的屏幕尺寸中水平设置弹性项目，请使用flex-*-row类。
各种屏幕尺寸均设置为小，中，大和特大屏幕尺寸。让我们看看如何在较小的屏幕尺寸下将弹性项目水平对齐-
<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>
以下是在不同屏幕尺寸上水平显示弹性项目的示例-
<!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>