简单教程
提交运行
代码编辑器：
<!DOCTYPE html> <meta charset="utf-8" /> <link rel="stylesheet" href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.css"> <div> <i class="fa fa-shield"></i> <i class="fa fa-shield fa-rotate-90"></i> <i class="fa fa-shield fa-rotate-180"></i> <i class="fa fa-shield fa-rotate-270"></i> <i class="fa fa-shield fa-flip-horizontal"></i> <i class="fa fa-shield fa-flip-vertical"></i> </div>
运行结果：