随机循环定时

timer.go

	var period int64 = 5

	var next_period = time.Now()

	var timer time.Duration

	time.Sleep(time.Second * 1)
	for {
		if next_period.Before(time.Now()) {
			next_period = time.Now()
		}
		timer = time.Duration(rand.Int63n(period)+1)*time.Second + (next_period.Sub(time.Now()))
		select {
		case <-time.After(timer):
			func() {
				fmt.Println("Print RUUUUUUUUUU: ", time.Now().Second())
				next_period = next_period.Add(time.Duration(period) * time.Second)
				fmt.Println("next_per sec: ", next_period.Second())
			}()
		}
	}