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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>表单控件大小</h2> <p>您可用 .form-control-lg 或 .form-control-sm 更改 .form-control 输入控件的大小：</p> <form> <input type="text" class="form-control form-control-lg" placeholder="大型输入控件"> <input type="text" class="form-control mt-3" placeholder="普通输入控件"> <input type="text" class="form-control form-control-sm mt-3" placeholder="小型输入控件"> </form> </div> </body> </html>