onComplete方法的第一个参数实际上是事件，所以你真的引用 fileName 与 responseJSON 。如果您更改方法参数以包含该事件，我认为应该可以正常工作。

The first parameter on the onComplete method is actually the event, so you're really referencing fileName with responseJSON. If you change your method parameters to include the event, I think that should work.

uploader.on "complete", (event, id, fileName, responseJSON)