openlayers--添加数据源

调用地图服务接口后，对接口返回值做处理--添加数据源

if(res.features.length) {
//获取--根据行政区代码查询对应行政区的中心点
  let lons = res.features[0].properties.LON;
  let lats = res.features[0].properties.LAT;
  pagemap.getView().setCenter([lons,lats])
  if(res.features && res.features.length > 0) {
    let { features } = res
　　//边界的点位数组---中心点点位的数组
    let polygonFeatures = [], pointFeatures = []
    //叠加边界以及数量
    features.map(feature => {
      //绘制边界
      let rings = feature.geometry.coordinates[0]
      let featurePolygon = new ol.geom.Polygon(rings)
      let _feature = new ol.Feature({geometry: featurePolygon})
　　　　//featureStyle  边界线以及边界内容的样式
      _feature.setStyle(this.featureStyle()['sourceData'])
      polygonFeatures.push(_feature)

      //绘制中心点文字
      let pointCenter = [feature.properties.LON,feature.properties.LAT];
      let featurePoint = new ol.geom.Point(pointCenter)
      let pointFeature = new ol.Feature({
        geometry: featurePoint,
        name: data.value,
      });
　　　　//createPointStyle  中心点的图文标注样式设置
      pointFeature.setStyle(this.createPointStyle(pointFeature));
    })
    //乡镇排名叠加火情点
    if(this.paimingArr){
      this.paimingArr.map(item=>{
        let pointFireCenter = [Number(item.longitude),Number(item.latitude)];
        let featureFirePoint = new ol.geom.Point(pointFireCenter)
        let pointFireFeature = new ol.Feature({
          geometry: featureFirePoint,
          name: item.towername,
        });
　　　　　//createImgStyle  行政区内所有点位的图文标注样式设置
        pointFireFeature.setStyle(this.createImgStyle(pointFireFeature));
        pointFireFeature.set('monthFireInfo',item);
        pointFeatures.push(pointFireFeature)
      })
    }
    this.addVectorLayers(pointFeatures)
    this.clickToPop();
  }
}