实现一个或两个发光二极管依次点亮；实现发光二极管从两边向中间点亮，再从中间向两边熄灭及调整闪亮的时间-One or two followed by light emitting diodes the realization of light-emitting diode lighting from both sides toward the middle, and then go out from the center to both sides and adjust the flashing