closed channel

func Test_chanel(t *testing.T) {
	c := make(chan int, 1)

	go func() {
		time.Sleep(time.Second * 3)
		close(c)
	}()

	for {
		select {
		case i := <-c:
			log.Printf("chan is closed, value is [%v]", i)
		}
	}
}

close的channel， 从里面可以一直取到值，不过是默认值，具体值取决于类型。