简单方式

package mainimport(        "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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