使用 std 模板包的 json 对象的前两个值

Question

api 的 json 响应是这样的

{

  "ResponseCode": "1",

  "Response": "Data Found",

  "data": [

    {

      "Season": "KHARIF",

      "Sector": "AGRICULTURE",

      "Category": "Cereals",

      "Crop": "Paddy (Dhan)",

      "QueryType": "\tField Preparation\t",

      "QueryText": "top dressing for paddy",

      "KccAns": "top dressing for paddy : apply urea 25kg+SSP 15kg +  neem cake 5kg+MN mixture 5kg mixed with 40kg of sand",

      "StateName": "PUDUCHERRY",

      "DistrictName": "KARAIKAL",

      "BlockName": "KARAIKAL",

      "CreatedOn": "1/5/2014 6:48:09 PM"

    },

    {

      "Season": "KHARIF",

      "Sector": "AGRICULTURE",

      "Category": "Others",

      "Crop": "Others",

      "QueryType": "Weather",

      "QueryText": "weather forecasting details",

      "KccAns": "today no rain",

      "StateName": "PUDUCHERRY",

      "DistrictName": "KARAIKAL",

      "BlockName": "KARAIKAL",

      "CreatedOn": "1/5/2014 9:04:50 PM"

    },

    {

      "Season": "KHARIF",

      "Sector": "AGRICULTURE",

      "Category": "Others",

      "Crop": "Others",

      "QueryType": "0",

      "QueryText": "details about soil testing",

      "KccAns": "contact to agricultural department",

      "StateName": "PUDUCHERRY",

      "DistrictName": "KARAIKAL",

      "BlockName": "KARAIKAL",

      "CreatedOn": "1/8/2014 10:21:18 AM"

    },

    {

      "Season": "KHARIF",

      "Sector": "AGRICULTURE",

      "Category": "Cereals",

      "Crop": "Paddy (Dhan)",

      "QueryType": "Fertilizer Use and Availability",

      "QueryText": "paddy top dressing fertilizer",

      "KccAns": "apply urea 25 kg + potash 15 kg + neem cake 5 kg + microfood 5 kg / ac",

      "StateName": "PUDUCHERRY",

      "DistrictName": "KARAIKAL",

      "BlockName": "KARAIKAL",

      "CreatedOn": "1/12/2014 8:01:45 AM"

    }

  ]

}

我正在尝试编写一个 golang 模板，它仅返回响应对象数据部分中的前两个数据点。{{range $element := .data}} {{$element}} {{end}}这是我目前正在使用的模板，但这会返回 .data 字段中的所有子数据。我怎样才能进行这个锻炼。

Answer 1

您可以使用slice模板函数获取前两个元素。例子：{{$dataSliced := slice .data 0 2}}{{range $element := $dataSliced}}    {{$element}}{{end}}或者您也可以为切片创建自定义模板函数。