golang waitGroup（1）

package main

import (
   "fmt"
   "sync"
   "time"
)

func main(){


   var wg sync.WaitGroup

   wg.Add(1)

   go func(){
      defer wg.Done()
      fmt.Println("1 gorountinue is sleeping")
      time.Sleep(2)
      fmt.Println("1 gorountinue exiting")
   }()
   wg.Add(1)

   go func(){
      defer wg.Done()
      fmt.Println("2 gorountinue is sleeping")
      time.Sleep(2)
      fmt.Println("2 gorountinue exiting")
   }()

   wg.Wait()



}