在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.1.0/css/bootstrap.min.css">
  <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.staticfile.org/popper.js/1.12.5/umd/popper.min.js"></script>
  <script src="https://cdn.staticfile.org/twitter-bootstrap/4.1.0/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container mt-3">
  <h2>排序</h2>
  <p>.order 类可以设置弹性子元素的排序，从 .order-1 到 .order-12，数字越低权重越高:</p>
  <div class="d-flex mb-3">
    <div class="p-2 order-3 bg-info">Flex item 1</div>
    <div class="p-2 order-2 bg-warning">Flex item 2</div>
    <div class="p-2 order-1 bg-primary">Flex item 3</div>
  </div>
</div>
</body>
</html>
源代码

动行结果
