golang 指定范围 生成随机数

示例如下：

import ("crypto/rand""fmt""math""math/big")func main() {// 生成 1000 个 [-10, 10) 范围的安全随机数。for i := 0; i < 1000; i++ {ret := RangeRand(-10, 10)fmt.Println(ret)}}// 生成区间[-m, n]的安全随机数func RangeRand(min, max int64) int64 {if min > max {panic("the min is greater than max!")}if min < 0 {f64Min := math.Abs(float64(min))i64Min := int64(f64Min)result, _ := rand.Int(rand.Reader, big.NewInt(max + 1 + i64Min))return result.Int64() - i64Min} else {result, _ := rand.Int(rand.Reader, big.NewInt(max-min+1))return min + result.Int64()}