主要類：
CCNode
CCDirector
CCScene
CCLayer
定時更新：
[[[CCDirector sharedDirector] scheduler] scheduleUpdateForTarget:self priority:0 paused:NO];
//[[[CCDirector sharedDirector] scheduler] unscheduleUpdateForTarget:self];
接收輸入：
v0.99
CCStandardTouchDelegate
CCTargetedTouchDelegate
v2.10
CCTouchOneByOneDelegate
CCTouchAllAtOnceDelegate
[[[CCDirector sharedDirector] touchDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];
//[[[CCDirector sharedDirector] touchDispatcher] removeDelegate:self];
坐標系統：
position是設置相對于父親節點的坐標
self.anchorPoint和self.position重合
多層：
[cclayer.addchild cclayer];
一層疊一層