int led_pin_array [4]= {13,12,14,26};
int size =sizeof(led_pin_array)/sizeof(led_pin_array[0]);
void setup() {
 for (int i =0;i<=size;i++){
  pinMode(led_pin_array[i], OUTPUT);
 }
}


  void loop() {
  // 将所有引脚设置为高电平
  for (int i=0;i<size;i++) {
    digitalWrite(led_pin_array[i], HIGH);
    if (i > 0){
      digitalWrite(led_pin_array[i-1], LOW);
      }else {
      digitalWrite(led_pin_array[size-1], LOW);
      }
    delay(250);
    
    }
}