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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>按钮大小</h2> <button type="button" class="btn btn-primary btn-lg">大型</button> <button type="button" class="btn btn-primary btn-md">默认</button> <button type="button" class="btn btn-primary btn-sm">小型</button> </div> </body> </html>