https://developers.weixin.qq.com/miniprogram/dev/OpenApiDoc/user-login/code2Session.html

状态码errcode不是必返回的吗?

Response Body: {"session_key":"mf0SvJzFdJ0lcicCbYXHcQ==","openid":"ox8J05Wt2dfMVFynxkBN6yjWQ50A"}