在Bootstrap 4中使用.align-items-*-center类在不同屏幕上的中心对齐单行项目。
让我们看看如何在小，中和大屏幕尺寸的中心对齐一行上的弹性项目-
<div class="d-flex flex-wrap align-items-sm-center bg-info" style="height:200px"> <div class="p-2 border">Item 1</div> <div class="p-2 border">Item 2</div> <div class="p-2 border">Item 3</div> <div class="p-2 border">Item 4</div> </div>
<div class="d-flex flex-wrap align-items-md-center bg-info" style="height:200px"> <div class="p-2 border">Item 1</div> <div class="p-2 border">Item 2</div> <div class="p-2 border">Item 3</div> <div class="p-2 border">Item 4</div> </div>
<div class="d-flex flex-wrap align-items-lg-center bg-info" style="height:200px"> <div class="p-2 border">Item 1</div> <div class="p-2 border">Item 2</div> <div class="p-2 border">Item 3</div> <div class="p-2 border">Item 4</div> </div>
您可以尝试运行以下代码以在特定屏幕上的中心对齐单行项目-
<!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 Flex Items on a single row in the center</h1> <div class="d-flex flex-wrap align-items-center bg-info" style="height:200px"> <div class="p-2 border">Item 1</div> <div class="p-2 border">Item 2</div> <div class="p-2 border">Item 3</div> <div class="p-2 border">Item 4</div> </div> <h2>Small Screen Size</h2> <div class="d-flex flex-wrap align-items-sm-center bg-secondary" style="height:200px"> <div class="p-2 border">Item 1</div> <div class="p-2 border">Item 2</div> <div class="p-2 border">Item 3</div> <div class="p-2 border">Item 4</div> </div> <h2>Medium Screen Size</h2> <div class="d-flex flex-wrap align-items-md-center bg-info" style="height:200px"> <div class="p-2 border">Item 1</div> <div class="p-2 border">Item 2</div> <div class="p-2 border">Item 3</div> <div class="p-2 border">Item 4</div> </div> <h2>Large Screen Size</h2> <div class="d-flex flex-wrap align-items-lg-center bg-info" style="height:200px"> <div class="p-2 border">Item 1</div> <div class="p-2 border">Item 2</div> <div class="p-2 border">Item 3</div> <div class="p-2 border">Item 4</div> </div> </div> </body> </html>