Golang计时器过期与VS停止之间的区别？

Question

Based on this example (https://gobyexample.com/timers), the timer can be either stopped or expired. But what are the differences?

package main
import "time"
import "fmt"

func main() {
    timer1 := time.NewTimer(time.Second*2)

    <-timer1.C
    fmt.Println("Timer 1 expired")

    timer2 := time.NewTimer(time.Second)
    go func() {
        <-timer2.C
        fmt.Println("Timer 2 expired")
    } ()
    stop2 := timer2.Stop()
    if stop2 {
        fmt.Println("Timer 2 stopped")
    }
}

Answer 1

Expired means that the timer has elapsed and sent the time on the channel. Stop() means that the program no longer wants the time to fire - it returns true if it was stopped successfully and false if the timer has already fired and sent the time on the channel.

See https://golang.org/pkg/time/#Timer.Stop for more details.