bool BackGroundLayer::init()
{

     frameCache=CCSpriteFrameCache::sharedSpriteFrameCache();
    
    CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();

    bgCell1=CCSprite::createWithSpriteFrame(frameCache->spriteFrameByName("bgCell.png"));
    bgSprintArr = CCArray::create();
    bgSprintArr->retain();

    bgSignArr=CCArray::create();
    bgSignArr->retain();

    CCSize sprintSize = bgCell1->getContentSize();
    bgCell1->setAnchorPoint(ccp(0,0));
    bgCell1->setPosition(ccp(0,0));
    this->addChild(bgCell1);
    bgSprintArr->addObject(bgCell1);

    int flipCount=visibleSize.width/sprintSize.width+1;//多加一张图片用来滚动替换
            
    for(int i=0;i<flipCount;i++)
    {
        bgCell2 = CCSprite::createWithSpriteFrame(frameCache->spriteFrameByName("bgCell.png"));
            bgCell2->setAnchorPoint(ccp(0,0));
        bgCell2->setPosition(ccp(sprintSize.width*(i+1)-(1+i),0));
        if(i%2==0)    //偶数
        {
            bgCell2->setFlipX(true);
        }
        this->addChild(bgCell2);
        bgSprintArr->addObject(bgCell2);
    }    
return true;
}