//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",

            Age: 1,

        })

        carMap[1] = carArr

    }

    return carMap

}

func main() {

    rs := Pluck()

    for _, item := range rs {

        for _, child := range item {

            fmt.Println(child.Brand)

        }

    }

}