60-24 模拟时钟分钟小时计数器。 分钟为60标号的计数器从0-1-2-……58-59 循环往复，完成1个分循环，小时循环计数器加1；小时采用24小时制。-60-24 simulator of a clock, 60　is for minutes, starts　0 increased by 1,and cycle period is 60　once a cycle is finished, the 24 adding-type counter will increase by1 and cycle with a period of 24.