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<!DOCTYPE html> <html> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <div class="container mt-3"> <h3>输入框组</h3> <p> .input-group .input-group 类来向表单输入框中添加更多的样式，如图标、文本或者按钮，.input-group-prepend 类添加在前面，.input-group-append 添加在后面。</p> <p>使用 .input-group-text 类来设置文本的样式。</p> <form action="/action_page.php"> <div class="input-group mb-3"> <div class="input-group-prepend"> <span class="input-group-text">@</span> </div> <input type="text" class="form-control" placeholder="Username" id="usr" name="username"> </div> <div class="input-group mb-3"> <input type="text" class="form-control" placeholder="Your Email" id="mail" name="email"> <div class="input-group-append"> <span class="input-group-text">@runoops.com</span> </div> </div> <button type="submit" class="btn btn-primary">Submit</button> </form> </div> </body> </html>
运行结果：