在Bootstrap 4中使用.align-items-*-start类在不同屏幕上从开始对齐项目的单行。
对于不同的屏幕尺寸，将该类用作-
在小屏幕上对齐单行项目
<div class="d-flex flex-wrap align-items-sm-start bg-secondary" style="height:200px"> <div class="p-2 border">Product 1</div> <div class="p-2 border">Product 2</div> <div class="p-2 border">Product 3</div> <div class="p-2 border">Product 4</div> </div>
在中等屏幕上对齐单行项目
<div class="d-flex flex-wrap align-items-md-start bg-primary" style="height:200px"> <div class="p-2 border">Product 1</div> <div class="p-2 border">Product 2</div> <div class="p-2 border">Product 3</div> <div class="p-2 border">Product 4</div> </div>
在大屏幕上对齐单行项目
<div class="d-flex flex-wrap align-items-lg-start bg-info" style="height:200px"> <div class="p-2 border">Product 1</div> <div class="p-2 border">Product 2</div> <div class="p-2 border">Product 3</div> <div class="p-2 border">Product 4</div> </div>
以下是在不同屏幕上从头开始对齐单行项目的示例-
<!DOCTYPE html> <html> <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</h1> <div class="d-flex flex-wrap align-items-start bg-primary" style="height:200px"> <div class="p-2 border">Product 1</div> <div class="p-2 border">Product 2</div> <div class="p-2 border">Product 3</div> <div class="p-2 border">Product 4</div> </div> <h2>Small Screen Size</h2> <div class="d-flex flex-wrap align-items-sm-start bg-secondary" style="height:200px"> <div class="p-2 border">Product 1</div> <div class="p-2 border">Product 2</div> <div class="p-2 border">Product 3</div> <div class="p-2 border">Product 4</div> </div> <h2>Medium Screen Size</h2> <div class="d-flex flex-wrap align-items-md-start bg-primary" style="height:200px"> <div class="p-2 border">Product 1</div> <div class="p-2 border">Product 2</div> <div class="p-2 border">Product 3</div> <div class="p-2 border">Product 4</div> </div> <h2>Large Screen Size</h2> <div class="d-flex flex-wrap align-items-lg-start bg-info" style="height:200px"> <div class="p-2 border">Product 1</div> <div class="p-2 border">Product 2</div> <div class="p-2 border">Product 3</div> <div class="p-2 border">Product 4</div> </div> </div> </body> </html>