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GoLang Switch语句里的fallthrough 介绍

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GoLang Switch语句里的fallthrough 关键字比较特殊。下面举个例子形象说明。

GoLang Switch fallthrough

Go: Switch fallthrough
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package main

import "fmt"

func main() {
    switch a := 3; {
    case a >= 2:
        fmt.Println(">=2")
        fallthrough
    case a >= 3:
        fmt.Println(">=3")
        fallthrough
    case a >= 4:
        fmt.Println(">=4")
        fallthrough
    case a >= 5:
        fmt.Println(">=5")
        fallthrough
    default:
        fmt.Println("default")
    }
}

输出:

Bash: output
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5
>=2
>=3
>=4
>=5
default

可以看出,fallthrough 语句是不退出当前 case 语段去实行下一个 case 语段,且不去判断 case 条件的去实行。

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