过三个按钮选择不同模式的亮灯方案，模式一：当k1按下时LED灯奇偶闪烁；模式二：当k2按下时LED灯来回轮流亮；模式三：当k1、k2、k3同时打开时LED灯亮灭闪烁；模式四：当k3按下时LED都灭。三种模式可以随意切换，还带有暂停和复位功能。-The three button to　the lighting scheme, different modes: when K1 is pressed LED lights flashing mode two: parity　when K2 is pressed LED light turns back and forth　mode three: when K1, K2, K3 and open LED lights off flashing　mode four: when K3 is pressed out of LED. Three modes can be switched freely, but also with pause and reset function.