break语句是否会从switch / select中断开？ [英] Does a break statement break from a switch/select?

问题描述

我知道 switch / select 语句在每种情况下都会自动中断。我想知道，在下面的代码中：

I know that switch/select statements break automatically after every case. I am wondering, in the following code:

for {
    switch sometest() {
    case 0:
        dosomething()
    case 1:
        break
    default:
        dosomethingelse()
    }
}

break 语句是否退出 循环还是 switch 块？

Does the break statement exit the for loop or just the switch block?

推荐答案

Break语句，《 Go编程语言规范》。

break语句终止执行最里面的 for，
switch或 select语句。

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

BreakStmt = "break" [ Label ] .

如果有标签，则必须为 for， switch $的标签b $ b或 select语句，即执行终止
的语句（§For语句，§Switch语句，§Select语句）。

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
      }
  }

因此，示例中的 break 语句终止开关语句，即最里面的语句。

Therefore, the break statement in your example terminates the switch statement, the "innermost" statement.

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