golang實現base62編碼

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package mainimport (    "fmt"    "math")var base = []string {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","1","2","3","4","5","6","7","8","9","0"}func base62encode(num int) string {    baseStr := ""    for {        if num <= 0 {            break        }        i := num % 62        baseStr += base[i]        num = (num - i) / 62    }    return baseStr}func base62decode(base62 string) int {    rs := 0    len := len(base62)    f := flip(base)    for  i := 0; i < len; i++ {        rs += f[string(base62[i])] * int(math.Pow(62, float64(i)))    }    return rs}func flip(s []string) map[string]int {    f := make(map[string]int)    for index, value := range s {        f[value] = index    }    return f}func main() {    m := base62encode(12645354)    fmt.Println(m)    fmt.Println(base62decode(m))}