* golang 的 Context包，是專門用來簡化對于處理單個請求的多個goroutine之間與請求域的數據、取消信號、截止時間等相關操作，這些操作可能涉及多個 API 調用 * 理解 Go Context 機制 :[https://juejin.im/entry/58088180c4c971005879b184](https://juejin.im/entry/58088180c4c971005879b184) * context :[https://juejin.im/post/5a6873fef265da3e317e55b6](https://juejin.im/post/5a6873fef265da3e317e55b6) ~~~ package main import ( "context" "fmt" "time" ) func main() { m1 := make(map[int]context.CancelFunc) for i := 1; i < 3; i++ { var ctx context.Context ctx, m1[i] = context.WithCancel(context.Background()) go func(c context.Context, n int) { for { select { case <-c.Done(): return default: time.Sleep(time.Second) fmt.Println(n) } } }(ctx, i) } time.Sleep(time.Second * 5) f :=m1[1] f() time.Sleep(time.Second * 20) } ~~~