https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Receiving_event_pushes.html 用户扫描带参数二维码关注时，微信公众平台没有返回对应的ticket，具体返回信息如下 <xml> <ToUserName><![CDATA[gh_3c9b10438888]]></ToUserName> <FromUserName><![CDATA[ogOpsuAmOuYmjYTkP69Xuc8I8GSM]]></FromUserName> <CreateTime>1595400083</CreateTime> <MsgType><![CDATA[event]]></MsgType> <Event><![CDATA[subscribe]]></Event> <EventKey><![CDATA[qrscene_10000004]]></EventKey> </xml>