在Bootstrap 4 中在不同的屏幕上从开始对齐一个 flex 项目
在 Bootstrap 4中使用 .align-self-*-start 来在不同的屏幕上从开始对齐一个 flex 项目。
要在不同的屏幕上对齐 flex 项目 -
小屏幕
<div class="d-flex 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 align-self-sm-start">Item 3</div> <div class="p-2 border">Item 4</div> </div>
大屏幕
<div class="d-flex bg-primary" style="height:200px"> <div class="p-2 border">Item 1</div> <div class="p-2 border">Item 2</div> <div class="p-2 border align-self-lg-start">Item 3</div> <div class="p-2 border">Item 4</div> </div>
我们来看一个完整的示例,在不同的屏幕上从开始对齐一个 flex 项目-
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://ajax.googleapis.com/ajax/libs/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 from the start</h1> <div class="d-flex 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 align-self-start">Item 3</div> <div class="p-2 border">Item 4</div> </div> <h2>Small Screen Size</h2> <div class="d-flex 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 align-self-sm-start">Item 3</div> <div class="p-2 border">Item 4</div> </div> <h2>Medium Screen Size</h2> <div class="d-flex bg-primary" style="height:200px"> <div class="p-2 border">Item 1</div> <div class="p-2 border">Item 2</div> <div class="p-2 border align-self-md-start">Item 3</div> <div class="p-2 border">Item 4</div> </div> <h2>Large Screen Size</h2> <div class="d-flex 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 align-self-lg-start">Item 3</div> <div class="p-2 border">Item 4</div> </div> </div> </body> </html>
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