Go by Example 中文版: Switch 分支结构
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switch 是多分支情况时快捷的条件语句。 |
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package main |
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import ( "fmt" "time" ) |
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func main() { |
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一个基本的 |
i := 2
fmt.Print("write ", i, " as ")
switch i {
case 1:
fmt.Println("one")
case 2:
fmt.Println("two")
case 3:
fmt.Println("three")
}
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在同一个 |
switch time.Now().Weekday() {
case time.Saturday, time.Sunday:
fmt.Println("It's the weekend")
default:
fmt.Println("It's a weekday")
}
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不带表达式的 |
t := time.Now()
switch {
case t.Hour() < 12:
fmt.Println("It's before noon")
default:
fmt.Println("It's after noon")
}
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类型开关 ( |
whatAmI := func(i interface{}) {
switch t := i.(type) {
case bool:
fmt.Println("I'm a bool")
case int:
fmt.Println("I'm an int")
default:
fmt.Printf("Don't know type %T\n", t)
}
}
whatAmI(true)
whatAmI(1)
whatAmI("hey")
}
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$ go run switch.go Write 2 as two It's a weekday It's after noon I'm a bool I'm an int Don't know type string |
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