golang 简单函数耗时打点

简单方式

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)

}

更优雅的方式

func timeCost() func() {
start := time.Now()
return func() {
tc:=time.Since(start)
fmt.Printf("time cost = %v\n", tc)
}
}

调用方式：
defer timeCost()()

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