比如，设置了一个5秒的间隔，在间隔被改变为10秒时3秒已经过去了，那么下一个定时器事件将会在上一个定时器事件13秒后发生。
For example, if the interval is set to 5 seconds and 3 seconds have already elapsed before the interval is changed to 10 seconds, the next timer event will be 13 seconds from the last timer event.
串口和定时器的中断的子程序，对初学的朋友可能比较有用，已经过测试OK ！
Serial port and interrupt subroutine, the friends may be more useful for beginners, has been tested OK!
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