wx.login({
        success(res) {
          if (res.code) {
            var urlr =app.globalData.host + 'login/log/' + res.code + '/' + app.globalData.userName
            wx.request({
              method: "POST",
              url: urlr,
              success(res2) {
                getApp().globalData.openid = res2.data.openid          
                wx.redirectTo({
                  url: '/pages/service/service',
                })
              },     
            })
          } else {
            wx.showToast({
              title: '登陆失败',
              icon: "none"
            })
          }
        }
      })

wx.login成功后返回结果发送request获取openID

真机调试时 请求成功

预览时 请求失败

版本正式发布后 还是请求失败