// 必须是在用户已经授权的情况下调用
wx.getUserInfo({
  success: function(res) {
    var userInfo = res.userInfo
    var nickName = userInfo.nickName
    var avatarUrl = userInfo.avatarUrl
    var gender = userInfo.gender //性别 0：未知、1：男、2：女
    var province = userInfo.province
    var city = userInfo.city
    var country = userInfo.country
  }
})