go语言实现定时器的方法是什么

package mainimport (    "fmt"
    "time")func main() {    /*
        用sleep实现定时器
    */
    fmt.Println(time.Now())
    time.Sleep(time.Second)
    fmt.Println(time.Now())    /*
        用timer实现定时器
    */
    timer := time.NewTimer(time.Second)
    fmt.Println(<-timer.C)    /*
        用after实现定时器
    */
    fmt.Println(<-time.After(time.Second))

}

package main

import (    "fmt"
    "time")

func main() {
    tiker := time.NewTicker(time.Second)    for i := 0; i < 3; i++ {
        fmt.Println(<-tiker.C)
    }
}