layer.off(eventName, handler)

Stop listening to an event on this layer.
译：停止监听在这一层的事件。

layerA = new Layer
layerA.name = "layerA"

clickHandler = (event, layer) ->
    print "This layer was clicked", layer.name

layerA.on(Events.Click, clickHandler)
layerA.off(Events.Click, clickHandler)