微信小程序地图(map)组件点击(tap)获取经纬度的方法

const app = getApp()const markersize = 30function range(start, edge, step) { for (var ret = [];  (edge - start) * step > 0; start += step) {  ret.push(start); } return ret;}function markers(northeast, southwest, scale, width, height) { const markerslng = (northeast.longitude - southwest.longitude) * markersize / width const markerslat = (northeast.latitude - southwest.latitude) * markersize / height const maxlon = northeast.longitude const minlon = southwest.longitude const maxlat = northeast.latitude const minlat = southwest.latitude const lons = range(minlon, maxlon, markerslng) const lats = range(minlat, maxlat, markerslat) let _markers = [] lons.forEach((lon, i) => {  lats.forEach((lat, j) => {   _markers.push({    id: lon + ',' + lat,    latitude: lat,    longitude: lon,    iconPath: '/marker.png',    alpha: 0.1, //将图片设置为透明,通过开发者工具看不出效果,但真机是有效果的    width: markersize,    height: markersize   })  }) }) return _markers}Page({ data: {  polygons: [],  controls: [{   id: 1,   position: {    left: 0,    top: 300 - 50,    width: 50,    height: 50   },   clickable: true  }],  markers: [] }, createMarkers() {  this.mapCtx = wx.createMapContext('map')  const query = wx.createSelectorQuery()  const map = query.select('#map').boundingClientRect()  let that = this  that.mapCtx.getRegion({   success(res1) {    that.mapCtx.getScale({     success(res2) {      query.exec((res) => {       let width = res[0].width;       let height = res[0].height;       let _markers = markers(res1.northeast, res1.southwest, res2.scale, width, height)       that.data.markers = _markers       that.setData(that.data)      })     }    })   }  }) }, regionchange(e) {  this.createMarkers() }, markertap(e) {  console.log(e.markerId) }, controltap(e) {  console.log(e.controlId) }, onReady(e) {  this.createMarkers() }})