简单教程
提交运行
代码编辑器:
<!DOCTYPE htm> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.js"></script> <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <style>body {margin:20px}</style> <form role="form"> <span>帮助文本范例</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。本范例中的帮助文本总共有两行</span> </form>
运行结果: