vue+openlayers实现运动轨迹中遇到的问题_openlayers中vectorcontext 使用时总是报错怎么解决

  moveFeature(event){
    console.log(event)
    let time = event.frameState.time;
    this.distance = (this.distance + (this.speed * (time - this.lastTime)) / 1000) % 1;
    this.lastTime = time;
    const currentCoordinate = this.route.getCoordinateAt(
      this.distance > 1 ? 2 - this.distance : this.distance
    );
    this.geometryMove.setCoordinates(currentCoordinate);
    const vectorContext = getVectorContext(e);
    vectorContext.setStyle(this.styles.featureMove);
    vectorContext.drawGeometry(this.geometryMove);
    this.map.render();
  },
  startAnimation(){
    this.lastTime = Date.now();
    this.lineLayer.on("postrender",this.moveFeature);
    this.featureMove.setGeometry(null);
  }
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这段代码是在网上看到的，借鉴了一下
运行之后moveFeature这个函数里面的event是undefined不知道怎么回事