[GoogleMap] 如何監聽zoom變更的控制

如何監聽zoom變更的控制

var 
 map = new google.maps.Map($mapElement[0], mapOptions);
                console.log($mapElement[0]);
                
                google.maps.event.addListener(map, 'zoom_changed', function () {
                    var zoomLevel = map.getZoom();
                    logger.debug('zoom_changed to level: ' + zoomLevel);
}