golang随机抽奖代码

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	//名单
	// 初始化 + 赋值一体化
	names := map[int]string{
		1:  "aa",
		2:  "bb",
		3:  "cc",
		4:  "dd",
		5:  "ee",
		6:  "ff",
		7:  "gg",
		8:  "hh",
		9:  "ii",
		10: "jj",
		11: "kk",
		12: "ll",
	}
	nums := generateRandomNumber(1, 12, 5)
	for i := 0; i < 5; i++ {
		fmt.Println(nums[i])
		fmt.Println(names[nums[i]])
	}
}

//生成若干个不重复的随机数
func RandomTestBase() {
	//测试5次
	for i := 0; i < 5; i++ {
		nums := generateRandomNumber(1, 12, 5)
		fmt.Println(nums)
	}
}

//生成count个[start,end)结束的不重复的随机数
func generateRandomNumber(start int, end int, count int) []int {
	//范围检查
	if end < start || (end-start) < count {
		return nil
	}
	//存放结果的slice
	nums := make([]int, 0)
	//随机数生成器，加入时间戳保证每次生成的随机数不一样
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	for len(nums) < count {
		//生成随机数返回一个取值范围在[0,n)的伪随机int值，如果n<=0会panic
		num := r.Intn((end - start + 1)) + start //注意，这里不保护n
		//查重
		exist := false
		for _, v := range nums {
			if v == num {
				exist = true
				break
			}
		}
		if !exist {
			nums = append(nums, num)
		}
	}
	return nums
}

3
cc
7
gg
12
ll
5
ee
6
ff