eggjs 的定时计时

[123s]

function startCron(interval, listener) {
  const now = Date.now();
  let nextTick;
  do {
    nextTick = interval.next().getTime();
  } while (now >= nextTick);

  setTimeout(() => {
    listener();
    startCron(interval, listener);
  }, nextTick - now);
}

这个 do...while 是干嘛的

[atian25]

`interval.next().getTime()` 有可能比当前时间晚，所以要一直获取直到第一个可用时间