CCDirector::sharedDirector()->getVisibleSize()问题

Cocos2d-x JavaScript
#1

C++的写法是CCDirector::sharedDirector()->getVisibleSize()，JS写成cc.Director.getVisibleSize，可是提示undefined，有大神帮忙看看吗

#2

director小写吧。。:2::2:

#3

改成小写了还是不行，是BUG吗