如何查看从Web方法返回的json字符串？

Question

我正在尝试了解如何在asp.net页面上查看从Web方法返回的json数据。该方法有效，但是我不确定如何查看数据。最终，我将这些数据绑定到一张世界地图上。这是代码块

        $( document ).ready(GetCountryData);
        function GetCountryData() {
            $.ajax({
                type: "POST",
                url: "Test.aspx/PopulateCountries",
                data: '{}',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: OnSuccess,
                failure: function(response) {
                    alert("Failure " + response.d);
                }
            });
        }
        function OnSuccess(response) {
            alert("Succuess " + response.d);
        }

这是网络方法

<WebMethod>
Public Shared Function PopulateCountries() As String
    Dim temp As String = Nothing
    Dim Product As New ProductsBLLWithSProcs
    Dim ds As New CountryBLLWithSProcs
    Dim dt As LocationsDataTable = ds.GetCountriesWithProducts
    Try
        temp = ToJSONRepresentation(dt)
    Catch ex As Exception
    End Try
    Return temp
End Function
Public Shared Function ToJSONRepresentation(dt As LocationsDataTable) As String
    Dim sb As StringBuilder = New StringBuilder()
    Dim jw As JsonWriter = New JsonTextWriter(New StringWriter(sb))
    For Each row As LocationsRow In dt.Rows

        jw.Formatting = Formatting.Indented
        jw.WriteStartObject()
        jw.WritePropertyName("id")
        jw.WriteValue(row.locCountry)
        jw.WritePropertyName("name")
        jw.WriteValue(row.locName)
        jw.WritePropertyName("quantity")
        jw.WriteValue(row.Quantity)
        jw.WriteEndObject()
    Next
    Return sb.ToString()
End Function

如何使用console.log方法或警报方法查看结果。感谢您的指导