Function hello

golang/go-study/go语言基础/并发/并发安全和锁/WaitGroup/waitgroup.go:15–18

()

var wg sync.WaitGroup

func hello() {
	defer wg.Done()
	fmt.Println("Hello Goroutine!")
}
func main() {
	wg.Add(1)
	go hello() // 启动另外一个goroutine去执行hello函数