之前base级别是可以获取到用户的unionid的 微信返回值如下：

"{"access_token":"4_fnOCtmxaP8LX5uMyw_ywbt7uarspAB87iYec5o7q1F0rKYV0bWnd6yJRSmBZ0-4HSDIxIdYt3auMH2b5TiIUvg","expires_in":7200,"refresh_token":"4_egFGokURBNm1wmzdbZ5ctxijsJfUSS_5yZQN4-5FMhHpraSJbO1KJBXayjA4nD25VIOaBa2f2hK4pyCAXVlwJg","openid":"oBj2mwjO4eYD3-NeIzGOq1ItKDjM","scope":"snsapi_base","unionid":"ok7mjwgD1bX4EBcZ7o8HXb3BMWDg"}"

现在的返回值如下：

"{"access_token":"4_l3XnnqJ8AKr80yTm5MjL7XfH_4uyEaEs1jNGnCqW8LlQRdZmajpPuzsfsaRuHNTm9uMwhPykAYl7CLD0ZaSjlA","expires_in":7200,"refresh_token":"4_hExJtyFVnjujXkGxGcH8_epn-B1ct2Svnxc8ds12xBJzC91PXwdRxcuz3YAUopMxiNB0SBPWc0LvQSXyuiAHHA","openid":"ofmwKxHJ81wzT5WJPO9EJLMOG4kI","scope":"snsapi_base"}"

调用的接口是：https://api.weixin.qq.com/sns/oauth2/access_token

现在测试号上调用还是和之前一样，但是线上环境调用unionid就丢失了 不知道是什么问题