How to use go language timer Timer and Ticker

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Timer 1-"* / 5 *" package mainimport ("fmt"github.com/robfig/cron") / / main function func main () {cron2: = cron.New () / / create an instance of cron / / execute scheduled tasks (every 5 seconds) err:= cron2.AddFunc ("* / 5 *" Print5) if erratic query nil {fmt.Println (err)} / / start / close cron2.Start () defer cron2.Stop () select {/ / query statement Keep the program running This is equivalent to for {} / / execute function func print5 () {fmt.Println ("execute cron every 5s")} setting description ┌─ second range (0-60) │ ┌─ min (0-59) │ │ ┌─ hour (0) -23) │ ┌─ day of month (1-31) │ ┌─ month (1-12) │ ┌─ day of week (0-6) (0 to 6 are Sunday to │ │ Saturday) │ * *

Asterisk (*): indicates that the cron expression can match all values in this field. If you use an asterisk (month) in the fifth field, it indicates that each month

Slash (/): indicates the growth interval. For example, the value of the second field (minutes) is 3-59 minutes 15, indicating that execution starts at the third minute of each hour, and then every 15 minutes (i.e., 3 (3), 18 (3), 33 (3), 48 (3)). Here, it can also be expressed as: 315 jump.

Comma (,): used to enumerate values, for example, the sixth field value is MON,WED,FRI, indicating execution on Monday, Wednesday and Friday

Hyphen (-): indicates a range, for example, a value of 9-17 in the third field indicates 9am to 5pm directly per hour (including 9 and 17)

Question mark (?): used only for Day of month and Day of week, indicating that no value is specified and can be used instead of *

Timer 2-Timer-TickerTimer / / time to generate an event Ticker / / time to cycle to generate an event Timer- only executes package mainimport ("fmt"time") func main () {/ / create a timer, setting the time to 2s after 2s Write content to time channel (current time) timer: = time.NewTimer (2 * time.Second) fmt.Println ("current time:", time.Now ()) / / 2s, then write data to timer.C. After you have the data, you can read t: =