break 语句是否从 switch/select 中断?

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，在以下代码中:

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 语句是退出 for 循环还是仅退出 switch 块?

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

推荐答案

break"语句终止最内层for"的执行，切换"或选择"语句.

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

BreakStmt = "break" [ Label ] .

如果有标签，它必须是一个封闭的for"，switch"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 语句终止了 switch 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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