CCFollow动作，可以让一个节点跟随另一个节点做位移。

CCFollow经常用来设置layer跟随sprite，可以实现类似摄像机跟拍的效果

效果是精灵在地图上移动，地图也会跟着移动，但是精灵仍然是在整个界面的中心位置

CCSize s = CCDirector::sharedDirector()->getWinSize();        pSprite->setPosition(ccp(-200, s.height / 2));        CCActionInterval* move      = CCMoveBy::create(2, ccp(s.width * 3, 0));        CCActionInterval* move_back = move->reverse();        CCFiniteTimeAction* seq       = CCSequence::create(move, move_back, NULL);        CCAction* rep               = CCRepeatForever::create((CCActionInterval*)seq);        pSprite->runAction(rep);        this->runAction(CCFollow::create(pSprite, CCRectMake(0, 0, s.width * 2 - 100, s.height)));

//三个动作都绑定一个函数，三个动作同时执行，执行完后响应函数

void ActionCallFunc::onEnter(){    ActionsDemo::onEnter();    centerSprites(3);    CCFiniteTimeAction*  action = CCSequence::create(        CCMoveBy::create(2, ccp(200,0)),        CCCallFunc::create(this, callfunc_selector(ActionCallFunc::callback1)),         NULL);    CCFiniteTimeAction*  action2 = CCSequence::create(        CCScaleBy::create(2 ,  2),        CCFadeOut::create(2),        CCCallFuncN::create(this, callfuncN_selector(ActionSequence2::callback2)),         NULL);    CCFiniteTimeAction*  action3 = CCSequence::create(        CCRotateBy::create(3 , 360),        CCFadeOut::create(2),        CCCallFuncND::create(this, callfuncND_selector(ActionSequence2::callback3), (void*)0xbebabeba),         NULL);    m_grossini->runAction(action);    m_tamara->runAction(action2);    m_kathia->runAction(action3);}void ActionCallFunc::callback1(){    CCSize s = CCDirector::sharedDirector()->getWinSize();    CCLabelTTF *label = CCLabelTTF::create("callback 1 called", "Marker Felt", 16);    label->setPosition(ccp( s.width/4*1,s.height/2));    addChild(label);}void ActionCallFunc::callback2(CCNode* pSender){    CCSize s = CCDirector::sharedDirector()->getWinSize();    CCLabelTTF *label = CCLabelTTF::create("callback 2 called", "Marker Felt", 16);    label->setPosition(ccp( s.width/4*2,s.height/2));    addChild(label);}void ActionCallFunc::callback3(CCNode* pTarget, void* data){    CCSize s = CCDirector::sharedDirector()->getWinSize();    CCLabelTTF *label = CCLabelTTF::create("callback 3 called", "Marker Felt", 16);    label->setPosition(ccp( s.width/4*3,s.height/2));    addChild(label);}