小编01e*_*gi4的帖子

我正在学习球拍,我需要一些帮助.如何仅运行此功能4次而不是无限运行？

(define loop
  (? ()
    (define delay (random 5))
    (digital-write led1 HIGH)
    (sleep delay)
    (displayln delay)
    (digital-write led1 LOW)
    (sleep delay)
    (loop)))