golang 跳出多重循环的高级break用法说明

I:
 for i := 0; i < 2; i++ {
 for j := 0; j < 5; j++ {
 if j == 2 {
 break I
 }
 fmt.Println("hello")
 }
 fmt.Println("hi")
 }

for {
 select{
 case <-tick.C:
  //do someting
 case <- stop:
  break //break的不是for循环, 而是跳脱select，执行doNext()
 }
 doNext()
}

LOOP: for {
 select{
 case <-tick.C:
  //do someting
 case <- stop:
  break LOOP//break的for循环,跳转执行doOther()
 }
 doNext()
}
doOther()

for {
 select{
 case <-tick.C:
  //do someting
 case <- stop:
  return //干净利落，适合退出goroutin的场景
 }
 doNext()
}
doOther()

isStop := false
for {
 select{
 case <-tick.C:
  //do someting
 case <- stop:
  isStop = true//干净利落，适合退出goroutin的场景
  break
 }
 if isStop {
 break
 }
 doNext()
}
doOther()