map组件在使用定点的时候，我在后端获取到 经纬度，在开发者工具上可以显示 定点。 但是在 手机上就不显示定点了，这个怎么处理

const App = getApp()

Page({

data: {

centerX: '',

centerY: '',

markers: [],

ddd:''

},

onReady: function (e) {

// 使用 wx.createMapContext 获取 map 上下文

this.mapCtx = wx.createMapContext('myMap')

},

onLoad: function () {

this.getlist()

console.log('地图定位！')

let that = this

// 获取自己的位置

wx.getLocation({

type: 'gcj02', //返回可以用于wx.openLocation的经纬度

success: (res) => {

console.log(res)

let latitude = res.latitude;

let longitude = res.longitude;

let marker = that.createMarker(res);

that.setData({

centerX: longitude,

centerY: latitude,

markers: that.getSchoolMarkers()

})

}

});

},

getlist(){

var _this=this

App._get('data_service/gis', {}, function (res) {

console.log(res)

_this.setData({

ddd: res

})

});

},

getSchoolMarkers() {

let markers = [];

var schoolData= this.data.ddd

for (let item of schoolData) {

let marker = this.createMarker(item);

markers.push(marker)

}

return markers;

},

moveToLocation: function () {

this.mapCtx.moveToLocation()

},

createMarker(point) {

let latitude = point.latitude;

let longitude = point.longitude;

let marker = {

iconPath: "../../images/map/map.png",

id: point.id || 0,

name: point.siteName || '',

latitude: latitude,

longitude: longitude,

water: point.waterLevel || '--',

width: 25,

height: 48,

customCallout:{

display: 'BYCLICK',

anchorX: 0,//横向偏移

anchorY: 0,

}

};

return marker;

},

// 移动地图时触发

regionchange(e) {

console.log(e.type)

},

// 点击标记点时触发

markertap(e) {

console.log(e, e.markerId);

var data = this.data.ddd;

},

// 点击控件时触发

controltap(e) {

console.log(e.controlId)

this.moveToLocation()

},

})