微信小程序城市定位的实现实例（获取当前所在国家城市信息）

http://apis.map.qq.com/ws/geocoder/v1/?location=39.984154,116.307490&key=OB4BZ-D4W3U-B7VVO-4PJWW-6TKDJ-WPB77

{
 "status": 0,
 "message": "query ok",
 "request_id": "6225548022856589453",
 "result": {
 "location": {
  "lat": 39.984154,
  "lng": 116.30749
 },
 "address": "北京市海淀区北四环西路66号彩和坊路",
 "formatted_addresses": {
  "recommend": "海淀区中关村彩和坊路中国技术交易大厦",
  "rough": "海淀区中关村彩和坊路中国技术交易大厦"
 },
 "address_component": {
  "nation": "中国",
  "province": "北京市",
  "city": "北京市",
  "district": "海淀区",
  "street": "彩和坊路",
  "street_number": "北四环西路66号"
 },
 "ad_info": {
  "adcode": "110108",
  "name": "中国,北京市,北京市,海淀区",
  "location": {
  "lat": 39.984154,
  "lng": 116.307487
  },
  "nation": "中国",
  "province": "北京市",
  "city": "北京市",
  "district": "海淀区"
 },
 "address_reference": {
  "business_area": {
  "title": "中关村",
  "location": {
   "lat": 39.984058,
   "lng": 116.307518
  },
  "_distance": 0,
  "_dir_desc": "内"
  },
  "famous_area": {
  "title": "中关村",
  "location": {
   "lat": 39.984058,
   "lng": 116.307518
  },
  "_distance": 0,
  "_dir_desc": "内"
  },
  "crossroad": {
  "title": "彩和坊路/北四环西路辅路(路口)",
  "location": {
   "lat": 39.985001,
   "lng": 116.308113
  },
  "_distance": 104.2,
  "_dir_desc": "西南"
  },
  "village": {
  "title": "稻香园北社区",
  "location": {
   "lat": 39.983269,
   "lng": 116.301979
  },
  "_distance": 480.1,
  "_dir_desc": "东"
  },
  "town": {
  "title": "海淀街道",
  "location": {
   "lat": 39.984154,
   "lng": 116.307487
  },
  "_distance": 0,
  "_dir_desc": "内"
  },
  "street_number": {
  "title": "北四环西路66号",
  "location": {
   "lat": 39.984119,
   "lng": 116.307503
  },
  "_distance": 6.9,
  "_dir_desc": ""
  },
  "street": {
  "title": "彩和坊路",
  "location": {
   "lat": 39.984154,
   "lng": 116.308098
  },
  "_distance": 49.1,
  "_dir_desc": "西"
  },
  "landmark_l1": {
  "title": "北京中关村创业大街",
  "location": {
   "lat": 39.984055,
   "lng": 116.306992
  },
  "_distance": 43.9,
  "_dir_desc": "东"
  },
  "landmark_l2": {
  "title": "中国技术交易大厦",
  "location": {
   "lat": 39.984154,
   "lng": 116.307487
  },
  "_distance": 0,
  "_dir_desc": "内"
  }
 }
 }
}

// 服务调用地址：http://localhost:3000/lbs/location

router.get('/lbs/location', function (req, res, next) {
 let lat = req.query.latitude
 let lng = req.query.longitude

 request.get({
 uri: 'https://apis.map.qq.com/ws/geocoder/v1/',
 json: true,
 qs: {
 location: `${lat},${lng}`,
 key: '你的腾讯地图密钥key'
 }
 }, (err, response, data) => {
 if (response.statusCode === 200) {
 responseUtil.jsonSuccess(res, data)
 } else {
 responseUtil.jsonError(res, 10001, '')
 }
 })
})

Page({

 data: {
 address: {}
 },

 onLoad: function () {
 //获取当前经纬度信息
 wx.getLocation({
 success: ({latitude, longitude}) => {

 //调用后台API，获取地址信息
 wx.request({
  url: 'http://localhost:3000/lbs/location',

  data: {
  latitude: latitude,
  longitude: longitude
  },

  success: (res) => {
  let info = res.data.data.result.ad_info
  this.setData({ address: info })
  },

  fail: () => {
  },

  complete: () => {
  }
 })
 }
 })
 }

})

<view>
 <view>{{address.nation}}</view>
 <view>{{address.city}}</view>
 <view>{{address.district}}</view>
</view>