CCSpriteFrameCache::sharedSpriteFrameCache()->addSpriteFramesWithFile("last.plist","last.png");        CCTexture2D *texture=CCTextureCache::sharedTextureCache()->textureForKey("last.png");        CCSpriteBatchNode *node=CCSpriteBatchNode::createWithTexture(texture);        addChild(node);        CCSprite *s1=CCSprite::createWithSpriteFrameName("bird.png");        s1->setPosition(ccp(35,32.5));        node->addChild(s1);        CCSprite *s2=CCSprite::createWithSpriteFrameName("cat.png");        s2->setPosition(ccp(100,100));        node->addChild(s2);