在Bootstrap 4的不同屏幕上从头开始对齐弹性项目

在Bootstrap 4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>

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