package main

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

func GetRandomString1(l int) string {
    str := "0123456789abcdefghijklmnopqrstuvwxyz"   //把需要的字符放进一个字符串中
    bytes := []byte(str)                              //转换为切片类型
    result := []byte{}
    r := rand.New(rand.NewSource(time.Now().UnixNano()))    //随机下标，
    for i := 0; i < l; i++ {
        result = append(result, bytes[r.Intn(len(bytes))])   //添加进字符串中
    }
    return string(result)
}
func main(){
    str:=GetRandomString1(64)                   //得到随机字符串
    fmt.Println(str)
}