Cesium 点击获取经纬度坐标

var handler= new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
handler.setInputAction(function (event) {
     var earthPosition  = viewer.camera.pickEllipsoid(event.position,viewer.scene.globe.ellipsoid);
     var cartographic = Cesium.Cartographic.fromCartesian(earthPosition, viewer.scene.globe.ellipsoid, new Cesium.Cartographic());
     var lat=Cesium.Math.toDegrees(cartographic.latitude);
     var lng=Cesium.Math.toDegrees(cartographic.longitude);
     var height=cartographic.height;
     console.log("[Lng=>"+lng+",Lat=>"+lat+",H=>"+height+"]");
    }, Cesium.ScreenSpaceEventType.LEFT_CLICK);