golang的Timer定时器

Posted 2021-01-11

// code_047_Timer project main.go
package main

import (
    "fmt"
    "time"
)

func main() {
    timer1 := time.NewTimer(time.Second * 2)
    t1 := time.Now()
    fmt.Printf("t1:%v
", t1)

    t2 := <-timer1.C
    fmt.Printf("t2:%v
", t2)

    //如果只是想单纯的等待的话，可以使用 time.Sleep 来实现
    timer2 := time.NewTimer(time.Second * 2)
    <-timer2.C
    fmt.Println("2s后")

    time.Sleep(time.Second * 2)
    fmt.Println("再一次2s后")

    <-time.After(time.Second * 2) //time.After函数的返回值是chan Time
    fmt.Println("再再一次2s后")

    timer3 := time.NewTimer(time.Second)
    go func() {
        <-timer3.C
        fmt.Println("Timer 3 expired")
    }()

    stop := timer3.Stop() //停止定时器
    ////阻止timer事件发生，当该函数执行后，timer计时器停止，相应的事件不再执行
    if stop {
        fmt.Println("Timer 3 stopped")
    }

    fmt.Println("before")
    timer4 := time.NewTimer(time.Second * 5) //原来设置5s
    timer4.Reset(time.Second * 1)            //重新设置时间,即修改NewTimer的时间
    <-timer4.C
    fmt.Println("after")
}