go语言学习--go中的map切片

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//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)         }     } }