微信第三开放平台
调用接口：GET https://api.weixin.qq.com/sns/component/jscode2session?appid=APPID&js_code=JSCODE&grant_type=authorization_code&component_appid=COMPONENT_APPID&component_access_token=COMPONENT_ACCESS_TOKEN
无法返回UnionID

f返回参数：获取微信开放平台userInfo[{"sessionKey":"tu4mtbVaDSNzpHEML6MbYA==","openid":"oTkx_5YD9Y7eiIBnloGNF0Zs3npY"}]