制定长度的随机字符串的问题.~

```go // 生成指定长度的字符串 func RandomStr(len int) (salt []byte) { salt = make([]byte, len) rnd := rand.New(rand.NewSource(time.Now().UnixNano())) for i := 0; i < 6;i++ { salt[i] = byte(rnd.Intn(95) + 32) } return } ``` 然后打印10次,: ```shell salt = (T(Q]! salt = (T(Q]! salt = (T(Q]! salt = (T(Q]! salt = (T(Q]! salt = (T(Q]! salt = (T(Q]! salt = s0H1(! salt = s0H1(! salt = s0H1(! ``` ** WTF ** : 随机字符串有这么难写吗? 问题在哪里?