这个程序重点改进了时钟的的表针的算法；而且增加了多个可以由用户自定义的功能，这样主要的属性定义都交给用户，方便得多了。 -focus on the process of improving the hand of the clock algorithm; but the number could increase by the user-defined function, a major attribute definition to the user, is much more convenient.