byte == uint8
    rune == int32

    1. package main
    3. import (
    4.     "fmt"
    5. )
    7. func main() {
    8.     s := reverse("冉rxy!")
    9.     fmt.Println(s)
    10. }
    12. func reverse(s string) string {
    13.     var r = []rune(s)
    14.     for i, j := 0, len(r)-1; i < j; i++ {
    15.         r[i], r[j] = r[j], r[i]
    16.         j--
    17.     }
    18.     return string(r)
    19. }

    []byte to string:
    string(b)