go get github.com/atotto/clipboard

package main

import (
  "fmt"
  "github.com/atotto/clipboard"
  "math/rand"
  "strings"
  "time"
)

var a = [...]string{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
  "1", "2", "3", "4", "5", "6", "7", "8", "9", "0"}

func main() {
  s := g()
  fmt.Println(s)
  //復制內容到剪貼板
  clipboard.WriteAll(s)
}

func g() string {
  var builder strings.Builder
  for i := 0; i  10; i++ {
    rand.Seed(time.Now().UnixNano())
    time.Sleep(1 * time.Nanosecond)
    c := rand.Intn(36)
    builder.WriteString(a[c])
  }
  return builder.String()
}