Golang 生成随机数字、随机字符串

func RandomInt(start int,end int) int{
    rand.Seed(time.Now().UnixNano())
    random:=rand.Intn(end-start)
    random = start + random
    return random
}

func RandString(len int) string {
    r := rand.New(rand.NewSource(time.Now().UnixNano()))
    bytes := make([]byte, len)
    for i := 0; i < len; i++ {
        b := r.Intn(26) + 65
        bytes[i] = byte(b)
    }
    return string(bytes)
}