golang怎么生成随机数

func RandInt(min, max int) int {
    if min >= max || min == 0 || max == 0 {
        return max
    }
    return rand.Intn(max-min) + min}

const (
    KC_RAND_KIND_NUM   = 0  // 纯数字
    KC_RAND_KIND_LOWER = 1  // 小写字母
    KC_RAND_KIND_UPPER = 2  // 大写字母
    KC_RAND_KIND_ALL   = 3  // 数字、大小写字母)// 随机字符串func Krand(size int, kind int) []byte {
    ikind, kinds, result := kind, [][]int{[]int{10, 48}, []int{26, 97}, []int{26, 65}}, make([]byte, size)
    is_all := kind > 2 || kind < 0
    rand.Seed(time.Now().UnixNano())
    for i :=0; i < size; i++ {
        if is_all { // random ikind
            ikind = rand.Intn(3)
        }
        scope, base := kinds[ikind][0], kinds[ikind][1]
        result[i] = uint8(base+rand.Intn(scope))
    }
    return result}