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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</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>选择菜单的大小</h2> <p>请使用 .form-select-lg 或 .form-select-sm 类来改变选择菜单的大小：</p> <form> <select class="form-select form-select-lg"> <option>1</option> <option>2</option> <option>3</option> <option>4</option> </select> <select class="form-select mt-3"> <option>1</option> <option>2</option> <option>3</option> <option>4</option> </select> <select class="form-select form-select-sm mt-3"> <option>1</option> <option>2</option> <option>3</option> <option>4</option> </select> </form> </div> </body> </html>