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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Bootstrap 实例 - 表单帮助文本</title> <link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css"> <script src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script> <script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></script> </head> <body> <form role="form"> <span>帮助文本实例</span> <input class="form-control" type="text" placeholder=""> <span class="help-block">一个较长的帮助文本块,超过一行, 需要扩展到下一行。本实例中的帮助文本总共有两行。</span> </form> </body> </html>
运行结果