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Bootstrap输入框组件的学习代码，供大家参考，具体内容如下
<html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE-edge"> <meta name="viewport" content="width=device-width,initial-scale=1"> <title>Bootstrap 101 Template</title> <link href="http://cdn.bootcss.com/bootstrap/3.3.1/css/bootstrap-theme.min.css" rel="external nofollow" rel="stylesheet"> <link href="http://cdn.bootcss.com/bootstrap/3.3.1/css/bootstrap.min.css" rel="external nofollow" rel="stylesheet"> </head> <body> <!-- span的位置决定前后 --> <!-- input-group-addon\input-group\form-control缺一不可 --> <div class="input-group"> <!-- 前面 --> <span class="input-group-addon">@ </span> <input type="text" class="form-control" placeholder="Username"> </div> <br/> <div class="input-group"> <input type="text" class="form-control" placeholder="Username"> <span class="input-group-addon">@ </span> </div> <br/> <!-- 大号 --> <div class="input-group input-group-lg"> <span class="input-group-addon">@ </span> <input type="text" class="form-control" placeholder="Username"> <span class="input-group-addon">qq </span> </div> <br/> <!-- form表单 form-control的效果--> <form action="" method="post" role="form"> <div class="form-group"> <label for="username">username:</label> <input class="form-control" id="username" name="username" type="text"><br> </div> <div class="form-group"> <label>password:</label> <input class="form-control" name="password" type="text"><br> </div> <input type="submit" value="submit"><input type="reset" value="reset"> </form> <script src="http://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script> <script src="http://cdn.bootcss.com/bootstrap/3.3.1/js/bootstrap.min.js"></script> <script src="http://cdn.bootcss.com/bootstrap/3.3.1/js/npm.js"></script> </body> </html></div>
结果：
