加载bing directions模块Angular

Question

使用bing地图，目前我可以创建地图添加图钉和更新图钉

我现在尝试做的是创建/更新路由，但是loadModule函数没有触发

  Microsoft.Maps.loadModule('Microsoft.Maps.Directions', function() {
        //Create an instance of the directions manager.
        this.directionsManager = new Microsoft.Maps.Directions.DirectionsManager(this.map);

        console.log(this.directionsManager)//This doesn't show

        //Set the request options that uses kilometers.
        this.directionsManager.setRequestOptions({
          distanceUnit: Microsoft.Maps.Directions.DistanceUnit.km
        });
        //Make the route line thick and green.
        this.directionsManager.setRenderOptions({
          drivingPolylineOptions: {
            strokeColor: 'green',
            strokeThickness: 6
          }
        });

      });

正如我所说的，我可以做这样的事情；

this.map = new Microsoft.Maps.Map(...)

或

this.user = new Microsoft.Maps.Pushpin(...)