显示分秒4位数码管4 4位数码管显示分秒，可以自动暂停、开始、复位，还有好多功能 。所以大家可以下下呵呵呵！！！只是给初学者看得。 -4 digital tube display minutes and seconds, can be automatically suspended, start, reset, there are a lot of functions . So we can next hehehe!!! Just for beginners to