golang中map的用法存储函数

package main

import (
    "runtime"
    "sync"
    "os"
    "os/signal"
    "syscall"
    "fmt"
)

//定义函数类型

type Msg func(name string) string

func main() {
    runtime.GOMAXPROCS(runtime.NumCPU())
    wg := &sync.WaitGroup{}
    c := make(chan os.Signal, 1)
    handleMap := make(map[int]Msg)
    handleMap[1] = handle1
    handleMap[2] = handle2
    handleMap[3] = handle3

    signal.Notify(c, os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT)
    go func() {
        sig := <-c
        _ = sig
        s := handleMap[3]
        s("测试")
        wg.Done()
    }()
    wg.Add(1)
    fmt.Println("执行任务～～～")
    wg.Wait()
    fmt.Printf("结束")
}

func handle1(name string) string {
    fmt.Println(name)
    return "handle1"

}
func handle2(name string) string {
    fmt.Println("handle2")
    return "handle2"

}
func handle3(tt string) string {
    fmt.Println(tt)
    return "handle3"

}

执行结果

执行任务～～～
测试
结束
Process finished with exit code 0