在Bootstrap 4的不同屏幕上从头开始对齐弹性项目
在Bootstrap4中使用.align-self-*-start类在不同屏幕上从头开始对齐flex项目。
在不同屏幕上对齐弹性项目-
小萤幕
<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>
大萤幕
<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>
让我们看一个完整的示例，以从头开始在不同的屏幕上对齐弹性项目：
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://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 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>