void HelloWorld::callback1(){    CCSize s = CCDirector::sharedDirector()->getWinSize();    CCLabelTTF *label = CCLabelTTF::create("callback1", "", 16);    label->setPosition(ccp(s.width / 4 * 1, s.height /2));    addChild(label);}void HelloWorld::callback2(cocos2d::CCNode *pSender){    CCSize s = CCDirector::sharedDirector()->getWinSize();    CCLabelTTF *label = CCLabelTTF::create("callback2", "", 16);    label->setPosition(ccp(s.width / 4 * 2, s.height /2));    addChild(label);}void HelloWorld::callback3(cocos2d::CCNode *pTarget, void *data){    CCSize s = CCDirector::sharedDirector()->getWinSize();    CCLabelTTF *label = CCLabelTTF::create("callback3", "", 16);    label->setPosition(ccp(s.width / 4 * 3, s.height /2));    addChild(label);}

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