把接口调用成功的回调函数返回的参数 return 出去 用 Promise 来实现

public.js

// 引入接口
let request = require('@/common/request.js')
module.exports = {
  // 获取位置
  getLocation() {
    return new Promise((resolve, reject) => {
      uni.getLocation({
        type: 'wgs84',
        success(res) {
          let latitude = res.latitude;
          let longitude = res.longitude;
          request.reverseGeocoder({
            location: {
              latitude: latitude,
              longitude: longitude
            },
            success(res) {
              // 把结果返回出去
              resolve(res.result);
            }
          });
        },
      });
    })
  },

  // 获取用户信息
  getUserInfo(userid) {
    return new Promise((resolve, reject) => {
      request.get_userinfo({
        userid: userid
      }, (res) => {
        if (res.code == 0) {
          resolve(res.data)
        } else {
          request.showToast(res.message)
        }
      })
    })
  },
}

index.js

let publicJS = require('@/common/public.js');
 
async locationSelect() {
    let locationData = await publicJS.getLocation()
    console.log('ret', locationData)
},

async userInfo() {
    let that = this
    let userInfo = await commentJs.getUserInfo(that.userid)
    console.log('userInfo', userInfo)
}