void MotionStreakTest1::onEnter(){    MotionStreakTest::onEnter();    CCSize s = CCDirector::sharedDirector()->getWinSize();      // the root object just rotates around    m_root = CCSprite::create(s_pPathR1);    addChild(m_root, 1);    m_root->setPosition(ccp(s.width/2, s.height/2));      // the target object is offset from root, and the streak is moved to follow it    m_target = CCSprite::create(s_pPathR1);    m_root->addChild(m_target);    m_target->setPosition(ccp(s.width/4, 0));    // create the streak object and add it to the scene    streak = CCMotionStreak::create(2, 3, 32, ccGREEN, s_streak);    addChild(streak);    // schedule an update on each frame so we can syncronize the streak with the target    schedule(schedule_selector(MotionStreakTest1::onUpdate));      CCActionInterval* a1 = CCRotateBy::create(2, 360);    CCAction* action1 = CCRepeatForever::create(a1);    CCActionInterval* motion = CCMoveBy::create(2, ccp(100,0) );    m_root->runAction( CCRepeatForever::create((CCActionInterval*)(CCSequence::create(motion, motion->reverse(), NULL)) ) );    m_root->runAction( action1 );//最后的颜色会跟背景色一致，这样就达到逐渐消失的效果    CCActionInterval *colorAction = CCRepeatForever::create((CCActionInterval *)CCSequence::create(        CCTintTo::create(0.2f, 255, 0, 0),        CCTintTo::create(0.2f, 0, 255, 0),        CCTintTo::create(0.2f, 0, 0, 255),        CCTintTo::create(0.2f, 0, 255, 255),        CCTintTo::create(0.2f, 255, 255, 0),        CCTintTo::create(0.2f, 255, 0, 255),        CCTintTo::create(0.2f, 255, 255, 255),        NULL));    streak->runAction(colorAction);}void MotionStreakTest1::onUpdate(float delta){//先获取精灵m_target左上角的坐标，然后赋值给streak,m_target的坐标一直在变化    streak->setPosition( m_target->convertToWorldSpace(CCPointZero) );}