程序功能：灯按照10101010（1代表亮，0代表不亮）的顺序，隔一段时间，所有灯状态取反，如此反复运行，按每0.5秒的时间间隔实现灯的闪烁。





程序说明：本程序将延迟函数定义在主函数之后，主程序中调用延迟函数时需要先声明。-Program features: Light accordance 10101010 (1 for brighter, 0 does not shine) order, from time to time, all the lights status negated, so repeated runs per 0.5 seconds intervals to achieve lights flashing. Program Descr iption: This program will be delayed after the main function in the function definition, the main program when calling the delay function needs to be declared.