访问第三级 JSON 对象的 Google App 脚本答案

【问题标题】：Google App Script accessing third level JSON object访问第三级 JSON 对象的 Google App 脚本
【发布时间】：2021-02-26 01:35:29
【问题描述】：

当我尝试在我的 Google 表格上调用 hello() 时，它返回

错误类型错误：无法读取属性 '5。未定义的汇率'（第 50 行）。

还设置了 Apps 脚本的触发器

Criteria	set
Choose which function to run	hello
Which runs at deployment	head
Select event source	From spreadsheet
Select event type	On Open
Failure notification settings	Notify me Daily

JSON 对象

{
    "Realtime Currency Exchange Rate": {
        "1. From_Currency Code": "USD",
        "2. From_Currency Name": "United States Dollar",
        "3. To_Currency Code": "SGD",
        "4. To_Currency Name": "Singapore Dollar",
        "5. Exchange Rate": "1.32783000",
        "6. Last Refreshed": "2021-02-26 01:28:59",
        "7. Time Zone": "UTC",
        "8. Bid Price": "1.32783000",
        "9. Ask Price": "1.32783000"
    }
}

Google 应用脚本函数

function hello(){
  var usdCurrency = "USD";
  var AV_API_Key = "KEYS";
  var sgdCurrency = "SGD"
  var url = "https://www.alphavantage.co/query?function=CURRENCY_EXCHANGE_RATE&from_currency=" + usdCurrency + "&to_currency=" + sgdCurrency  + "&apikey=" + AV_API_Key;

  var response =  UrlFetchApp.fetch(url);
  var result =  JSON.parse(response.getContentText());
  var currencyPrice = result["Realtime Currency Exchange Rate"]["5. Exchange Rate"];
  
  Logger.log(currencyPrice); // 1.32794000
  Logger.log(typeof(currencyPrice)); // String
  return currencyPrice;
  
}

更新

我设置了一个名为jsonObj的预定义变量，它能够获取对象中的项目并将其放置在谷歌表格中。


function initTesting(){
  var jsonObj = {
    "Realtime Currency Exchange Rate": {
        "1. From_Currency Code": "USD",
        "2. From_Currency Name": "United States Dollar",
        "3. To_Currency Code": "SGD",
        "4. To_Currency Name": "Singapore Dollar",
        "5. Exchange Rate": "1.32783000",
        "6. Last Refreshed": "2021-02-26 01:28:59",
        "7. Time Zone": "UTC",
        "8. Bid Price": "1.32783000",
        "9. Ask Price": "1.32783000"
    }
};
var getPrice = jsonObj["Realtime Currency Exchange Rate"]["5. Exchange Rate"];
return getPrice;
}

【问题讨论】：

标签： javascript json rest google-apps-script alpha-vantage

【解决方案1】：

我不确定这是错误还是什么，但我有解决方案。

function hello(){
  var usdCurrency = "USD";
  var AV_API_Key = "KEYS";
  var sgdCurrency = "SGD"
  var url = "https://www.alphavantage.co/query?function=CURRENCY_EXCHANGE_RATE&from_currency=" + usdCurrency + "&to_currency=" + sgdCurrency  + "&apikey=" + AV_API_Key;

  var response =  UrlFetchApp.fetch(url);
  var result =  JSON.parse(response.getContentText());
  var currencyPrice = result["Realtime Currency Exchange Rate"]["5. Exchange Rate"];

尽管当我最初登录 Logger.log(typeof(currencyPrice)); 时，它在日志上显示了字符串。但是一旦我在下面的代码中使用String()，它就能够反映在谷歌表格上。

  Logger.log(currencyPrice); // 1.32794000
  Logger.log(typeof(currencyPrice)); // String
  // uses  String() on the currency price
  stringCurrencyPrice = String(currencyPrice)
  return stringcurrencyPrice;
  
}

}

【讨论】：