移动点的样式修改 

data(){
 return{
  changeFeature:null,
  map:null
 }
},
initMap(){
     const map = new Map({
        target: 'mapDiv',
        view: new View({
          center: [, ],
          zoom: 19,
          // rotation: 100,
          projection: '',
        }),
        controls: defaultControls({
          zoom: false,
          attribution: false,
          rotate: false,
        }),
      });
      this.map = map;
    this.map.on('singleclick', this.mapClick);//点击事件
    this.map.on('pointermove', this.mapMoveIn);//移入事件
},
mapMoveIn(evt){
 if(this.changeFeature){
   this.changeFeature.setStyle(new Style({
      image: new Icon({
      src: require('../../../assets/icons/xxx.png')
   })
  }))
 }
 const features = this.map.getFeaturesAtPixel(evt.pixel)
//判断移到点位上时，移到面或是线上不会触发
 if(this.map.hasFeatureAtPixel(evt.pixel) && features[0].getGeometry() instanceof Point){
        debugger
        this.changeFeature = features[0]
        features[0].setStyle(new Style({
          image:new CircleStyle({
            radius:20,
            fill:new Fill({
              color:'red'
            })	
          })	
        }))	
      }else{
        
      }
      
    },