源代码 -->
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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.net/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.staticfile.net/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> <form> <label for="demo">这里输入您的邮箱:</label> <div class="input-group mb-3"> <input type="text" class="form-control" placeholder="Email" id="demo" name="email"> <span class="input-group-text">@runoob.com</span> </div> </form> </div> </body> </html>
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