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<!DOCTYPE html> <html> <head> <title>Bootstrap5 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container mt-3"> <h3>设置下拉菜单</h3> <div class="input-group mt-3 mb-3"> <button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown"> 选择网站 </button> <ul class="dropdown-menu"> <li><a class="dropdown-item" href="https://www.google.com">GOOGLE</a></li> <li><a class="dropdown-item" href="http://www.runoops.com">RUNOOPS</a></li> <li><a class="dropdown-item" href="https://www.taobao.com">TAOBAO</a></li> </ul> <input type="text" class="form-control" placeholder="网站地址"> </div> </div> </body> </html>
运行结果：