###
可以让类继承于 CCNode 产生这个定时器，如果还没有作用，那么可以在初始化的时候加上：
CCNode::onEnter();
###
scheduleUpdate();
void schedule (SEL_SCHEDULE selector)
schedules a selector.
void schedule (SEL_SCHEDULE selector, ccTime interval)
schedules a custom selector with an interval time in seconds.
void unschedule (SEL_SCHEDULE selector)
unschedules a custom selector.
void unscheduleAllSelectors (void)
unschedule all scheduled selectors: custom selectors, and the 'update' selector.
###
CCScheduler *default_scheduler = CCDirector::sharedDirector()->getScheduler();
default_scheduler->scheduleUpdateForTarget(this, 0, false);
default_scheduler->unscheduleUpdateForTarget(this);
### 定時執行
//每一秒執行 GameLayer 的函數 Step(ccTime dt)
this->schedule(schedule_selector(GameLayer::Step), 1.0f);
void GameLayer::Step(ccTime dt)
{
}
### 延時執行
//延時5秒執行函數
this->schedule(schedule_selector(GameLayer::Step), 5.0f);
void GameLayer::Step(ccTime dt)
{
this->unschedule(schedule_selector(GameLayer::Step));
}
CCScheduler *default_scheduler = CCDirector::sharedDirector()->getScheduler();
default_scheduler->unscheduleUpdateForTarget(this);
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