* golang 的 Context包，是专门用来简化对于处理单个请求的多个goroutine之间与请求域的数据、取消信号、截止时间等相关操作，这些操作可能涉及多个 API 调用 * 理解 Go Context 机制 :[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) } ~~~