### 創建goroutine 只需要在函數調用語句錢添加go關鍵字,就可以創建并發執行單元.開發人員無需了解任何執行細節,調度 器會自動將其安排到合適的系統線程上執行. 在并發編程里,我們通常想講一個過程切分成幾塊,然后讓每個goroutine格子負責一塊工作.當一個程序啟 動時,其主函數即在一個單獨的goroutine中運行,我們叫它main goroutine .新的goroutine會用go 語句來創建. ### 實例 ~~~ func newTask() { for { fmt.Println("this is a newTask") time.Sleep(time.Second) } } func main() { go newTask() //新建一個協程,新建一個任務 for { fmt.Println("this is main goroutine") time.Sleep(time.Second) } } ~~~ ~~~ this is a newTask this is main goroutine this is a newTask this is main goroutine this is a newTask this is main goroutine ~~~ ### 主協程退出,其它子協程也會退出 ~~~ go func() { i := 0 for { i++ fmt.Printf("子協程 i = %d\n", i) time.Sleep(time.Second) } }() i := 0 for { i++ fmt.Printf("main i = %d\n", i) time.Sleep(time.Second) if i == 2 { break } } ~~~ ~~~ main i = 1 子協程 i = 1 子協程 i = 2 main i = 2 子協程 i = 3 ~~~