gmaps4rails和requestAnimationFrame

Question

我正在尝试在页面上自动显示地图，所以这是我的coffeescript：

handler = Gmaps.build('Google')

# Options list: https://developers.google.com/maps/documentation/javascript/reference#MapOptions
mapOptions =
  mapTypeId: google.maps.MapTypeId.HYBRID
  mapTypeControl: false
  zoomControl: false
  streetViewControl: false
  panControl: false
  overviewMapControl: false
  scaleControl: false
  draggable: false

handler.buildMap({ provider: mapOptions, internal: {id: 'map'}}, () -> handler.getMap().setZoom(2))

mapPanFx = (time) ->
  handler.getMap().panBy(x: 20, y: 0)
  window.requestAnimationFrame(mapPanFx)

mapStartPanFx = () -> window.requestAnimationFrame(mapPanFx)

mapStartPanFx() 

调用mapStartPanFx会导致地图从屏幕上完全消失。 gmaps4rails和动画不应该一起工作吗？