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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>弹性框</h2> <p>如需创建 flexbox 容器并将直接子项转换为 flex 项，请使用 d-flex 类：</p> <div class="d-flex p-3 bg-secondary text-white"> <div class="p-2 bg-info">弹性项目 1</div> <div class="p-2 bg-warning">弹性项目 2</div> <div class="p-2 bg-primary">弹性项目 3</div> </div> </div> </body> </html>