要在Bootstrap 4的不同屏幕上拉伸弹性项目，请使用.align-self-*-stretch类。
要在不同的屏幕上进行展示，您需要使用align-self-sm-stretch，align-self-md-stretch，align-self-lg-stretch等。以下是小屏幕尺寸的示例-
<div class="d-flex bg-secondary" style="height:200px"> <div class="p-2 border">A-one</div> <div class="p-2 border">B-one</div> <div class="p-2 border align-self-sm-stretch">C-one</div> <div class="p-2 border">D-one</div> </div>
您可以尝试运行以下代码以在不同的屏幕尺寸上拉伸弹性项目-
<!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"> <h1>Align Specific Flex Item and Stretch</h1> <div class="d-flex bg-primary" style="height:200px"> <div class="p-2 border">A-one</div> <div class="p-2 border">B-one</div> <div class="p-2 border align-self-stretch">C-one</div> <div class="p-2 border">D-one</div> </div> <h2>Small Screen Size</h2> <div class="d-flex bg-primary" style="height:200px"> <div class="p-2 border">A-one</div> <div class="p-2 border">B-one</div> <div class="p-2 border align-self-sm-stretch">C-one</div> <div class="p-2 border">D-one</div> </div> <h2>Medium Screen Size</h2> <div class="d-flex bg-secondary" style="height:200px"> <div class="p-2 border">A-one</div> <div class="p-2 border">B-one</div> <div class="p-2 border align-self-md-stretch">C-one</div> <div class="p-2 border">D-one</div> </div> <h2>Large Screen Size</h2> <div class="d-flex bg-info" style="height:200px"> <div class="p-2 border">A-one</div> <div class="p-2 border">B-one</div> <div class="p-2 border align-self-lg-stretch">C-one</div> <div class="p-2 border">D-one</div> </div> </div> </body> </html>