微信小程序如何把接口调用成功的回调函数返回的参数return出去？(promise就可以解决)

举个栗子
//获取应用实例
//const app = getApp()
//const util = require('../../utils/util.js')
//const sign = util.sign
//var Md5 = require('../../utils/md5.js');
Page({
  data: {  },
  onLoad: function () {
    //注释:promise 要用then接收  ,或者async await 

    let that = this
    that.login().then(res => {
      console.log(res) //打印出  1111 或者 2222
    })
  },
　//函数请求
  login() { 

    return new Promise(function (resolve, reject) {

      wx.request({
        url: app.globalData.url + '/user/wx/login',
        data: {
          openId: wx.getStorageSync("openId")
        },
        method: "POST",
        header: sign(),//根据自己需求
        success(res) {
          console.log(res)
          if(res.code == 500){
            resolve(1111)
          }else{
            resolve(2222)
          }
        }
      })
    })
  },
})