https://developers.weixin.qq.com/doc/oplatform/Mobile_App/WeChat_Login/Authorized_API_call_UnionID.html 获取用户个人信息（UnionID 机制） 目前接口返回的数据中，没有返回unionId response:{"openid":"o3PG1s8JitIZAeOK7rz8ArtRhcCw","nickname":"宁夏杨洋","sex":1,"language":"zh_CN","city":"吴忠","province":"宁夏","country":"中国","headimgurl":"http:\/\/thirdwx.qlogo.cn\/mmopen\/vi_32\/Q0j4TwGTfTLlVSjsLxrJickkIQ7nUJ8bTpuGfg9OgKvNXLNylE625T0yozO4SzANYaTuWT5uib83mjJu6dqHtiaCA\/132","privilege":[]}