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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>浮动标签 - 输入控件</h2> <p>请在输入框内点击，来查看浮动标签效果：</p> <form action="/demo/html/action_page.php"> <div class="form-floating mb-3 mt-3"> <input type="text" class="form-control" id="email" placeholder="请输入电邮地址" name="email"> <label for="email">电邮</label> </div> <div class="form-floating mt-3 mb-3"> <input type="text" class="form-control" id="pwd" placeholder="请输入密码" name="pswd"> <label for="pwd">密码</label> </div> <button type="submit" class="btn btn-primary">提交</button> </form> </div> </body> </html>