操作方法：
备注：UEditor插入视频，Object Iframe等标签被过滤问题处理
ueditor.all.js添加
case 'embed':
str = '<iframe frameborder="0" width="' + width + '" height="' + height + '" src="' + utils.html(url) + '" allowfullscreen="allowfullscreen"/> ';
break;
ueditor.config.js文件添加
iframe: ['frameborder', 'src', 'width', 'height']