https://rein.kr/posts/2010-02-13-%ED%94%84%EB%A1%9C%EA%B7%B8%EB%9E%98%EB%A8%B8%EC%9D%98-%EC%9D%BC%EC%83%81-%EB%8B%A4%EC%8B%9C-actionscript-%EC%82%BD%EC%A7%88/