//在init方法里面初始化当前的实例

bool HelloWorld::init()

{

    bool bRet = false;

    do

    {

        //CCLayer进行初始化，初始化失败跳出循环

        if ( !CCLayer::init() )

        {

            break;

        }

        //获取手机屏幕的大小

        CCSize size = CCDirector::sharedDirector()->getWinSize();

        //创建精灵1

        CCSprite *cat1 = CCSprite::create("cat.png");

        cat1->setPosition(ccp(, ));

        cat1->setPosition(ccp(, ));

        this->addChild(cat1);

        //创建精灵2

        CCSprite *cat2 = CCSprite::create("cat.png");

        cat2->setPosition(ccp(, ));

        cat2->setPosition(ccp(, ));

        this->addChild(cat2);

        //创建精灵3

        CCSprite *cat3 = CCSprite::create("cat.png");

        cat3->setPosition(ccp(, ));

        cat3->setPosition(ccp(,));

        this->addChild(cat3);

        //匀速的移动动作

        CCActionInterval* move = CCMoveBy::create(, CCPointMake(,));

        CCActionInterval* move_back = move->reverse();

        CCFiniteTimeAction* seq1 = CCSequence::create( move, move_back, NULL);

         cat1->runAction( CCRepeatForever::create((CCActionInterval*)seq1));

        //添加EaseBackIn缓动效果的移动动画

        CCActionInterval* move_ease_in = CCEaseBackIn::create((CCActionInterval*)(move->copy()->autorelease()) );

        CCActionInterval* move_ease_in_back = move_ease_in->reverse();

        CCFiniteTimeAction* seq2 = CCSequence::create( move_ease_in, move_ease_in_back, NULL);

        cat2->runAction( CCRepeatForever::create((CCActionInterval*)seq2));

        //添加EaseBackOut缓动效果的移动动画

        CCActionInterval* move_ease_out = CCEaseBackOut::create((CCActionInterval*)(move->copy()->autorelease()) );

        CCActionInterval* move_ease_out_back = move_ease_out->reverse();

        CCFiniteTimeAction* seq3 = CCSequence::create( move_ease_out, move_ease_out_back, NULL);

        cat3->runAction( CCRepeatForever::create((CCActionInterval*)seq3));    

        //接收界面的的触摸事件

        setTouchEnabled(true);

        bRet = true;

    } while ();

    //返回成功

    return bRet;

}