https://developers.weixin.qq.com/doc/oplatform/openApi/OpenApiDoc/miniprogram-management/login/thirdpartyCode2Session.html

调用此api 只返回了openid和session_key 两个参数，并没有示例中的unionid是什么原因

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 zhi'fan