wx.getUserInfo获取用户信息的时候，nickName变成了"微信用户"。
wx.getUserInfo已经废弃，现在用wx.getUserProfile
https://developers.weixin.qq.com/community/develop/doc/000cacfa20ce88df04cb468bc52801?highLine=getUserInfo
看公告 https://developers.weixin.qq.com/community/develop/doc/000ecabcb642185cfdfb78fe056c01 换新api获取用户信息了 getUserProfile
