# Golang 闭包实现装饰器

By [Robin](https://paragraph.com/@robin-8) · 2023-02-24

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    type MultiPlyFunc func(int, int) int
    
    func multiply1(a, b int) int {
        return a * b
    }
    
    func multiply2(a, b int) int {
        return a << b
    }
    
    func exctTime(f MultiPlyFunc) MultiPlyFunc {
        return func(a, b int) int {
            start := time.Now()
            c := f(a, b)
            end := time.Since(start)
            fmt.Printf("---执行耗时：%v ---\n", end)
            return c
        }
    }
    
    func main() {
        a := 2
        b := 8
        fmt.Println("算术运算：")
        decorator := exctTime(multiply1)
        c := decorator(a, b)
        fmt.Printf("%d x %d = %d\n", a, b, c)
    
        fmt.Println("位运算: ")
        decorator2 := exctTime(multiply2)
        a = 1
        b = 4
        c = decorator2(1, b)
        fmt.Printf("%d << %d = %d\n", a, b, c)
    }

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*Originally published on [Robin](https://paragraph.com/@robin-8/golang-3)*