4组流水灯的轮流显示,第一组由不亮到微亮；第二组由左到右依次变亮，第三组由右到左依次变亮，第四组全部亮灭闪烁。-the display of led lamp，the first turn lighter gradually,the second turn light from left to right,the third turn light from right to left,the last between turn light and turn down.