[TOC] # 主協程退出,子協程也跟著掛 ~~~ func main() { go func() { i := 0 for { i++ fmt.Println("子 i = ", i) time.Sleep(time.Second) } }() //別忘記() i := 0 for { i++ fmt.Println("main i = ", i) time.Sleep(time.Second) if i == 2 { break } } } ~~~ # 子協程退出 ~~~ import ( "runtime" "sync" ) func main() { wg := new(sync.WaitGroup) wg.Add(1) go func() { defer wg.Done() defer println("A.defer") func() { defer println("B.defer") runtime.Goexit() // 終止當前 goroutine println("B") // 不會執行 }() println("A") // 不會執行 }() wg.Wait() } ~~~ 輸出結果: ~~~ B.defer A.defer ~~~