function scraper() {
  // do something here
}

// CronJob runs function every hour at minute 0 second 0
const scraperTimer = new CronJob('0 0 */1 * * *', function () {
  // set random delay between 5(min) and 50(max) minutes
  const delay = Math.floor(Math.random() * (3e6 - 300000) +   300000);

  setTimeout(() => {
    scraper();
  }, delay);

  console.log(`running scraper in ${delay / 60000} minutes`);
});

scraperTimer.Start()

使用Cron和计时器时最好注意范围，内存泄漏可能会发生。