golang学习---练习1

第 0001 题：做为 Apple Store App 独立开发者，你要搞限时促销，为你的应用生成激活码（或者优惠券），使用 Python 如何生成 200 个激活码（或者优惠券）？

---

1. 每个激活码唯一
2. 200个激活码之间不能有关联（不能根据一个推断出另外一个）
3. 纯英文字符(url合法字符)

解答
随机数 + 时间戳（纳秒）->base64

package main
import (
    "fmt"
    "math/rand"
    "time"
    "encoding/base64"
)

func main()  {
    for i := 0; i < 20; i++ {
        //获取随机数
        randNum := rand.Int()
        //获取纳秒
        t := time.Now().UnixNano()
        result := fmt.Sprint(randNum) + fmt.Sprint(t)
        encoded := base64.StdEncoding.EncodeToString([]byte(result))
        fmt.Println(encoded)

    }
}

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