func main() {
    a := 123

    //如果是int ok 就为true 并把值附给val
    val, ok := interface{}(a).(int)

    selectType(a)
}

func selectType(a... interface{}) {
    for _, v := range a {
        switch v.(type) {
        case int:
            fmt.Println("is int type1")
        }
    }
}