我正在嘗試創建將輸出 JSON 的代碼。JSON 字符串表示發票及其行項目。有兩個主要部分，即標題記錄和項目列表。項目列表給我帶來了麻煩。它包含一組發票行項目。我無法弄清楚如何構建它。有人可以幫我解決這個問題嗎？package controllersimport (    "github.com/revel/revel")type Test struct {    *revel.Controller}type headerRecord struct {    ClientNumber string    BusinessUnit string    ValidationKey string    DataYear string    DataMonth string    TotalRevenue string}type dataRecord struct {    LineNumber string    InvoiceNumber string    CustomerNumber string    Zipcode string    TransDate string    Revenue string    TaxSitusRule string    TransTypeCode string    SalesTypeCode string    RegulatoryCode string    TaxExemptionCodeList []string    Geocode string}type request struct {    headerRecord    ItemList []dataRecord}func (c Test) Test() revel.Result {    request := request{        headerRecord: headerRecord{            ClientNumber: "0000000001",            BusinessUnit: "Biz Unit",            ValidationKey: "123456",            DataYear: "2016",            DataMonth: "05",            TotalRevenue: "600.00",        },        ItemList: []dataRecord{        },    }/*1st data record        LineNumber: "1",        InvoiceNumber: "123456",        Zipcode: "75024",        TransDate: "2016-05-15",        Revenue: "100.00",        TaxSitusRule: "05",        TransTypeCode: "050201",        SalesTypeCode: "B",        RegulatoryCode: "99",        TaxExemptionCodeList: []string{"00"},        Geocode: "", */    return c.RenderJSON(request)}