代码示例:(标识:bs_spinners_size)
<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap Example</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/js/bootstrap.min.js"></script>
</head>
<body>

<div class="p-4">
  <h2>加载器大小</h2>
  <p>请使用 <code>.spinner-border-sm</code> 或 <code>.spinner-grow-sm</code> 创建较小的加载器:</p>
  <div class="spinner-border spinner-border-sm"></div>
  <div class="spinner-grow spinner-grow-sm"></div>
</div>

</body>
</html>
运行结果: