https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_Open_Tag.htmlhttps://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_Open_Tag.htmlhttps://developers.weixin.qq.com/doc/offiaccount/Getting_Started/Overview.htmlhttps://developers.weixin.qq.com/doc/offiaccount/Getting_Started/Overview.html
ios登录微信公众号，然后清理后台微信程序，再登录微信，登录微信公众号，session丢失，重新登录
