计时器变为倒计时器的设计

Design of modifying timer into countdown timer

倒计时器的设计方法很多,通过巧妙的设计方法实现了所有计时器变为倒计时器。而且该设计方法适用于所有的十进制计时器,具有很好的普遍性和实用性。

There are many timer design methods available. To modify all kinds of timers into the countdown timers can be implemented with the clever design method created in this paper. The design method is suitable for all the decimalism timers, and has good universality and practicality.