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参考链接：https://studygolang.com/articles/13389 switch sExpr {
case expr1:
some instructions
case expr2:
some other instructions
case expr3:
some other instructions
default:
other code
}
sExpr和expr1、expr2、expr3的类型必须一致。Go的switch非常灵活，表达式不必是常量或整数，执行的过程从上至下，直到找到匹配项； 而如果switch没有表达式，它会匹配true。 Go里面switch默认相当于每个case最后带有break，匹配成功后不会自动向下执行其他case，而是跳出整个switch, 但是可以使用fallthrough强制执行后面的case代码。
测试用例： package main
import "fmt"
func main() {
switch {
case false:
fmt.Println("The integer was <= 4")
fallthrough
case true:
fmt.Println("The integer was <= 5")
fallthrough
case false:
fmt.Println("The integer was <= 6")
fallthrough
case true:
fmt.Println("The integer was <= 7")
case false:
fmt.Println("The integer was <= 8")
fallthrough
default:
fmt.Println("default case")
}
}
运行结果： The integer was <= 5 The integer was <= 6 The integer was <= 7
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