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<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>

<div class="container mt-3">
  <h3>Toast 实例</h3>
  <p>在这个例子中，我们使用一个按钮来显示 toast 消息。</p>

<button type="button" class="btn btn-primary" id="toastbtn">显示 Toast</button>
  
  <div class="toast">
    <div class="toast-header">
      <strong class="me-auto">Toast 标题</strong>
      <button type="button" class="btn-close" data-bs-dismiss="toast"></button>
    </div>
    <div class="toast-body">
      <p>toast 主体内的文本。</p>
    </div>
  </div>
</div>

</body>
</html>

W3School TIY Editor