原理：先亮红灯（保持一会儿）----红绿过度（绿加1、红减1循环240次）------

绿灯亮起(保持一会儿)----绿兰过度（兰加1、绿减1循环240次）-----兰灯亮起

（保持）-----兰白过度（绿加1、红加1循环240次、兰不变?---白红过度*/

-Principle: The first red light (while keeping)---- red and green over (plus one green, red minus 1 cycle 240 times)------ green light (to keep for a while)---- Green Blue excessive ( Langa a green minus one cycle 240 times)----- blue lights (to keep)----- blue white over (green plus one, plus one cycle 240 red, blue unchanged?--- White Excessive red* /