我需要從 Json 數組創建一個地圖，我從下面的 GO 開始，有點卡住，有什么指針嗎？    package mainimport (    "encoding/json"    "fmt"    "strconv")func main() {    jsonStr := `{  "employee": [    {      "id": 14325,      "grpname": "senior"    },    {      "id": 234,      "grpname": "junior"    }  ]}`    type Group struct {        Employee []struct {            GroupName string            GroupId   int        }    }    var group []Group    var groupMap []map[string]interface{}    err := json.Unmarshal([]byte(jsonStr), &groupMap)    if err != nil {        panic(err)    }    for _, groupData := range groupMap {        // convert map to array of Group struct        var g Group        g.GroupName = fmt.Sprintf("%s", groupData["grpname"])        g.GroupId, _ = strconv.Atoi(fmt.Sprintf("%v", groupData["id"]))        group = append(group, g)    }    fmt.Println(group)}錯誤：./prog.go:45:4: g.GroupName undefined (type Group has no field or method GroupName)./prog.go:46:4: g.GroupId undefined (type Group has no field or method GroupId)預期輸出：{"senior": 14325,"junior": 234}嘗試了一些類似下面的操作，但出現錯誤：出現錯誤：%!(EXTRA string=json: cannot unmarshal array into Go struct field GetEmpResponse.employee of type map[string][]model.Employee)類型 GetEmpResponse 結構 { Employee map[string][]Employee json:"employee" }為我的測試嘗試簡化Json，請參考 play.golang.org