golang 简单函数耗时

package main

import(

        "fmt"

        "time"

)

func main(){

        defer timeCost(time.Now())

        fmt.Println("start program")

        time.Sleep(5*time.Second)

        fmt.Println("finish program")

}

func timeCost(start time.Time){

        terminal:=time.Since(start)

        fmt.Println(terminal)

}