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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"> <h2>警告框动画</h2> <p>.fade 和 .show 类在关闭警报消息时添加淡入淡出效果。</p> <div class="alert alert-success alert-dismissible fade show"> <button type="button" class="btn-close" data-bs-dismiss="alert"></button> <strong>成功！</strong>此警报框表示成功或积极的动作。 </div> <div class="alert alert-info alert-dismissible fade show"> <button type="button" class="btn-close" data-bs-dismiss="alert"></button> <strong>信息！</strong>此警报框表示中性的信息更改或操作。 </div> <div class="alert alert-warning alert-dismissible fade show"> <button type="button" class="btn-close" data-bs-dismiss="alert"></button> <strong>警告！</strong>此警报框表示可能需要注意的警告。 </div> <div class="alert alert-danger alert-dismissible fade show"> <button type="button" class="btn-close" data-bs-dismiss="alert"></button> <strong>危险！</strong>此警报框表示危险或潜在的负面操作。 </div> <div class="alert alert-primary alert-dismissible fade show"> <button type="button" class="btn-close" data-bs-dismiss="alert"></button> <strong>基本！</strong>此警报框表示重要的动作。 </div> <div class="alert alert-secondary alert-dismissible fade show"> <button type="button" class="btn-close" data-bs-dismiss="alert"></button> <strong>次要！</strong>此警报框表示不太重要的操作。 </div> <div class="alert alert-dark alert-dismissible fade show"> <button type="button" class="btn-close" data-bs-dismiss="alert"></button> <strong>深色！</strong>深灰色警报。 </div> <div class="alert alert-light alert-dismissible fade show"> <button type="button" class="btn-close" data-bs-dismiss="alert"></button> <strong>浅色！</strong>浅灰色警报。 </div> </div> </body> </html>