有时候，根据策划需求的效果，需要所有Sprte同时执行某一个动作，那么一般想到的是每个Sprite都执行型runAction,但是这样的话增加了代码量，我们会采用引擎提供的另一种方法,设置级联，调用setCascadeOpacityEnabled设置为true

看如下代码：

void ActionFade::onEnter()
{
    ActionsDemo::onEnter();
 
    centerSprites(2);
 
    //m_tamara->setOpacity( 0 );
    CCActionInterval*  action1 = CCFadeIn::create(1.0f);
    CCActionInterval*  action1Back = action1->reverse();
 
    CCActionInterval*  action2 = CCFadeOut::create(1.0f);
    CCActionInterval*  action2Back = action2->reverse();
 
	m_tamara->addChild(m_kathia);///

	m_tamara->setCascadeOpacityEnabled(true); //设置级联关系
	CCActionInterval *move = CCMoveBy::create(0.5f,ccp(m_tamara->getPositionX() - 20,m_tamara->getPositionY()));
	CCActionInterval *back = move->reverse();
    //m_tamara->runAction( CCSequence::create( action2,action1Back,NULL));
	m_tamara->runAction(CCRepeatForever::create(CCSequence::create( move,back,NULL)));
    //m_kathia->runAction( CCSequence::create( action2,action2Back,NULL));
	this->addChild(m_tamara);
}