go语言中数字如何转字符串

package main

import (

  "fmt"

  "strings"

  "strconv"

)

type IPAddr [4]byte

func (p IPAddr) String() string {

    var ipParts []string

    for _, item := range p {

ipParts = append(ipParts, strconv.Itoa(int(item)))

    }

    return strings.Join(ipParts, ".")

}

func main() {

    hosts := map[string]IPAddr{

"loopback":  {127, 0, 0, 1},

"googleDNS": {8, 8, 8, 8},

    }

    for name, ip := range hosts {

fmt.Printf("%v: %v\n", name, ip)

    }

}