1：timer
学习自：https://studygolang.com/articles/2479
timer1 := time.NewTimer(time.Second * 2) //此处在等待channel中的信号，执行此段代码时会阻塞两秒 <-timer1.C
timer1 := time.NewTimer(time.Second * 2)
//此处在等待channel中的信号，执行此段代码时会阻塞两秒
<-timer1.C
ticker := time.NewTimer(time.Second)
for_ =range ticker.C{
}
或者
for {
select {
case <-timer.C:
func()
}
}
timer中：
type Ticker struct {
C <-chan Time // The channel on which the ticks are delivered.
r runtimeTimer
}
C只能读不能写
https://studygolang.com/articles/4565
2："github.com/robfig/cron"中的cron
package main
import (
"github.com/robfig/cron"
"log"
)
func main() {
i := 0
c := cron.New()
spec := "*/5 * * * * ?"
c.AddFunc(spec, func() {
i++
log.Println("cron running:", i)
})
c.AddFunc("@every 1h1m", func() {
i++
log.Println("cron running:", i)
})
c.Start()
}