Question

所以我正在尝试解析一个json文件。我正在使用警报来获取特定字段的值，但每当我传递此特定字符串时，它都显示为nan

myjsondata=JSON.parse(json);
alert(myjsondata.result.parameters.College-name);

Json文件

`{
  "id": "1",
  "timestamp": "2017-05-11T04:03:26.008Z",
  "lang": "en",
  "result": {
    "source": "agent",
    "resolvedQuery": "hi",
    "action": "input.welcome",
    "actionIncomplete": false,
    "parameters": {
       "College-name": "Apex Technical School"},
    "contexts": [],
    "metadata": {
      "intentId": "b11a9493-7c2f-47c0-9928-5653a10c86e9",
      "webhookUsed": "false",
      "webhookForSlotFillingUsed": "false",
      "intentName": "Default Welcome Intent"
    },
    "fulfillment": {
      "speech": "Hi welcome from webfocus Api Ai",
      "messages": [
        {
          "type": 0,
          "speech": "Hi welcome from webfocus Api Ai"
        },
        {
          "type": 0,
          "speech": ""
        }
      ]
    },
    "score": 1
  },
  "status": {
    "code": 200,
    "errorType": "success"
  },
  "sessionId": "04737548-a3ff-485d-af1a-304edfee9486"
}`

警告行动和其他领域工作正常。但是对于大学来说，它显示为NAN

Answer 1

您收到空值，因为parameters没有名为College-name的密钥：

"parameters": {},

此外，您可能希望使用以下方式更改您的选择：

alert(myjsondata.result.parameters['College-name']);

Answer 2

您没有关注json style guide，您无法将{json中的任何媒体资源称为.College-name

   var myjsondata = {
  "id": "1",
  "timestamp": "2017-05-11T04:03:26.008Z",
  "lang": "en",
  "result": {
    "source": "agent",
    "resolvedQuery": "hi",
    "action": "input.welcome",
    "actionIncomplete": false,
    "parameters": {
      // 'College-name':'aa'
    },
    "contexts": [],
    "metadata": {
      "intentId": "b11a9493-7c2f-47c0-9928-5653a10c86e9",
      "webhookUsed": "false",
      "webhookForSlotFillingUsed": "false",
      "intentName": "Default Welcome Intent"
    },
    "fulfillment": {
      "speech": "Hi welcome from webfocus Api Ai",
      "messages": [
        {
          "type": 0,
          "speech": "Hi welcome from webfocus Api Ai"
        },
        {
          "type": 0,
          "speech": ""
        }
      ]
    },
    "score": 1
  },
  "status": {
    "code": 200,
    "errorType": "success"
  },
  "sessionId": "04737548-a3ff-485d-af1a-304edfee9486"
}
alert(myjsondata.result.parameters['College-name']);

尝试这样，因此它会显示undefined，因为myjsondata对象中不存在

Json解析javascript：字符串显示为NAN

2 个答案: