golang break语句可以break掉select,switch,for

坑，以下例子中，原本以为close掉done channel后，循环会退出。但事实上会进入死循环

for {

        select {

        case packet := <-s.avPacketChan:

            s.sendPacket(packet)

        case  <-s.done: //终止channel

            break

        }

    }

原因:

[A "break" statement terminates execution of the innermost "for", "switch" or "select" statement.

官方文档](https://golang.org/ref/spec#Break_statements)

BreakStmt = "break" [ Label ] .

If there is a label, it must be that of an enclosing "for", "switch" or "select" statement, and that is the one whose execution terminates (§For statements, §Switch statements, §Select statements).

L:

  for i < n {

      switch i {

      case 5:

          break L // 从L标签处开始执行

      }

  }

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