Question

InitPlot(viewer, serverUrl){
                if (!viewer) {
                    return;
                }
                var campos = Cesium.Cartesian3.fromDegrees(121.58041176757547, 38.859240850898405, 500);
                viewer.scene.camera.flyTo({
                    destination: campos,
                    orientation: {
                        heading: Cesium.Math.toRadians(0),
                        pitch: -0.20917672793046682,
                        roll: 2.708944180085382e-13
                    }
                });
                this.plottingLayer = new Cesium.PlottingLayer(viewer.scene, "plottingLayer");

                viewer.scene.layers.add(this.plottingLayer);

                var plotting = Cesium.Plotting.getInstance(serverUrl, viewer.scene);

                var plotEditControl = new Cesium.PlotEditControl(viewer.scene, this.plottingLayer);//编辑控件
                plotEditControl.activate();

                /*this.plottingLayer=plottingLayer;*/

                var animationManager = plotting.getGOAnimationManager();

                this.animationManager=animationManager;

                setInterval(function execute() {
                    animationManager.execute();
                }, 100);

            },

老师您好，在vue项目中进行态势推演时，点击创建动画时，出现 cannot read property ‘animationManager’of undefined。但是这个变量我在data（）{}设置了，并且进行了this.animationManager=animationManager的赋值。