go语言学习--go中的map切片

//定义一个结构
type Car struct {
    Brand string
    Age int
}

func Pluck() map[int][]Car {
    carMap := make(map[int][]Car)
    carArr := make([]Car,0)
    carArr = append(carArr,Car{
        Brand: "audi",Age: 1,})
    carMap[1] = carArr
    //如果存在键,则添追加数据
    child,ok := carMap[1]
    if ok {
        child = append(child,Car{
            Brand:"QQ",Age:5,})
        carMap[1] = child
    } else {//第一次添加数据
        carArr := make([]Car,0)
        carArr = append(carArr,Car{
            Brand: "audi",})
        carMap[1] = carArr
    }
    return carMap
}
func main() {
    rs := Pluck()
    for _,item := range rs {
        for _,child := range item {
            fmt.Println(child.Brand)
        }
    }
}