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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"> <h3>带下拉按钮的输入组</h3> <p>在输入组中添加下拉按钮。请注意，您不需要像往常一样的 .dropdown 包装器。</p> <div class="input-group mt-3 mb-3"> <button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown"> 下拉按钮 </button> <ul class="dropdown-menu"> <li><a class="dropdown-item" href="#">链接 1</a></li> <li><a class="dropdown-item" href="#">链接 2</a></li> <li><a class="dropdown-item" href="#">链接 3</a></li> </ul> <input type="text" class="form-control" placeholder="用户名"> </div> </div> </body> </html>