> For the complete documentation index, see [llms.txt](https://ryanyang.gitbook.io/the-way-to-go-zh-cn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ryanyang.gitbook.io/the-way-to-go-zh-cn/di-er-bu-fen-yu-yan-de-he-xin-jie-gou-yu-ji-shu/05.0/05.5.md).

# Break 与 continue

您可以使用 break 语句重写 for2.go 的代码：

示例 5.10 [for3.go](https://github.com/yangchuansheng/the-way-to-go_ZH_CN/tree/f30ab7d8c58f85840a0afb548024b93642b518d5/eBook/examples/chapter_5/for3.go)：

```go
for {
    i = i - 1
    fmt.Printf("The variable i is now: %d\n", i)
    if i < 0 {
        break
    }
}
```

因此每次迭代都会对条件进行检查（i < 0），以此判断是否需要停止循环。如果退出条件满足，则使用 break 语句退出循环。

一个 break 的作用范围为该语句出现后的最内部的结构，它可以被用于任何形式的 for 循环（计数器、条件判断等）。但在 switch 或 select 语句中（详见第 13 章），break 语句的作用结果是跳过整个代码块，执行后续的代码。

下面的示例中包含了嵌套的循环体（for4.go），break 只会退出最内层的循环：

示例 5.11 [for4.go](https://github.com/yangchuansheng/the-way-to-go_ZH_CN/tree/f30ab7d8c58f85840a0afb548024b93642b518d5/eBook/examples/chapter_5/for4.go)：

```go
package main

func main() {
    for i:=0; i<3; i++ {
        for j:=0; j<10; j++ {
            if j>5 {
                break   
            }
            print(j)
        }
        print("  ")
    }
}
```

输出：

```
012345 012345 012345
```

关键字 continue 忽略剩余的循环体而直接进入下一次循环的过程，但不是无条件执行下一次循环，执行之前依旧需要满足循环的判断条件。

示例 5.12 [for5.go](https://github.com/yangchuansheng/the-way-to-go_ZH_CN/tree/f30ab7d8c58f85840a0afb548024b93642b518d5/eBook/examples/chapter_5/for5.go)：

```go
package main

func main() {
    for i := 0; i < 10; i++ {
        if i == 5 {
            continue
        }
        print(i)
        print(" ")
    }
}
```

输出：

```
0 1 2 3 4 6 7 8 9
```

显然，5 被跳过了。

另外，关键字 continue 只能被用于 for 循环中。

## 链接

* [目录](https://github.com/yangchuansheng/the-way-to-go_ZH_CN/tree/f30ab7d8c58f85840a0afb548024b93642b518d5/eBook/directory.md)
* 上一节：[for 结构](/the-way-to-go-zh-cn/di-er-bu-fen-yu-yan-de-he-xin-jie-gou-yu-ji-shu/05.0/05.4.md)
* 下一节：[标签与 goto](/the-way-to-go-zh-cn/di-er-bu-fen-yu-yan-de-he-xin-jie-gou-yu-ji-shu/05.0/05.6.md)


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