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源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Bootstrap 实例 - 输入框组的大小</title> <link href="//cdn.staticfile.net/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> <script src="//cdn.staticfile.net/jquery/2.1.1/jquery.min.js"></script> <script src="//cdn.staticfile.net/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script> </head> <body> <div style="padding: 100px 100px 10px;"> <form class="bs-example bs-example-form" role="form"> <div class="input-group input-group-lg"> <span class="input-group-addon">@</span> <input class="form-control" placeholder="Twitterhandle" type="text"> </div><br> <div class="input-group"> <span class="input-group-addon">@</span> <input class="form-control" placeholder="Twitterhandle" type="text"> </div><br> <div class="input-group input-group-sm"> <span class="input-group-addon">@</span> <input class="form-control" placeholder="Twitterhandle" type="text"> </div> </form> </div> </body> </html>
运行结果