//给精灵创建帧动画Animation* EnemyBase::createAnimation(std::string prefixName, int framesNum, float delay)  {  // 1      Vector<SpriteFrame*> animFrames;         // 2   for (int i = 1; i <= framesNum; i++)      {          char buffer[20] = { 0 };          sprintf(buffer, "_%i.png",  i);          std::string str =  prefixName + buffer;          auto frame = SpriteFrameCache::getInstance()->getSpriteFrameByName(str);          animFrames.pushBack(frame);      }      // 3      return Animation::createWithSpriteFrames(animFrames, delay);  }