cesium实时捕获entity实体移动的坐标

viewer.clock.onTick.addEventListener(function(clock) {

          var curtime = viewer.clock.currentTime;

          //笛卡尔坐标

          var pos = entity._position.getValue(curtime, null);

          var cartographic = Cesium.Ellipsoid.WGS84.cartesianToCartographic(

            pos

          );

          //经纬度坐标

          var lon = Cesium.Math.toDegrees(cartographic.longitude);

          var lat = Cesium.Math.toDegrees(cartographic.latitude);

          var height = cartographic.height;

          var pmpos = Cesium.SceneTransforms.wgs84ToWindowCoordinates(

            Viewer.scene,

            pos

          );

          var info =

            lon.toFixed(8) + "," + lat.toFixed(8) + "," + height.toFixed(8);

          console.log(info);

        });