Nodejs 返回 Blockchain Rates API 的完整 JSON，但我无法访问其中的特定对象。为什么？

Question

我有一个文件向 blockchain.info/ticker API 发出请求，以获取比特币的最新价格。

script.js：

let request = require('request');
let url = "https://blockchain.info/ticker"

request.get(url,
function(error, response, body) {
    console.log(body); //first
    console.log(body.USD); //second
});

request.get 中的第一个 console.log 语句返回：

{
  "USD" : {"15m" : 1034.99, "last" : 1034.99, "buy" : 1033.63, "sell" : 1034.99,  "symbol" : "$"},
  "ISK" : {"15m" : 116090.37, "last" : 116090.37, "buy" : 115937.82, "sell" : 116090.37,  "symbol" : "kr"},
  "HKD" : {"15m" : 8043.46, "last" : 8043.46, "buy" : 8032.89, "sell" : 8043.46,  "symbol" : "$"},
  "TWD" : {"15m" : 31374.69, "last" : 31374.69, "buy" : 31333.46, "sell" : 31374.69,  "symbol" : "NT$"},
  "CHF" : {"15m" : 1030.89, "last" : 1030.89, "buy" : 1029.53, "sell" : 1030.89,  "symbol" : "CHF"},
  "EUR" : {"15m" : 963.89, "last" : 963.89, "buy" : 962.63, "sell" : 963.89,  "symbol" : "€"},
  "DKK" : {"15m" : 7170.6, "last" : 7170.6, "buy" : 7161.17, "sell" : 7170.6,  "symbol" : "kr"},
  "CLP" : {"15m" : 685784.37, "last" : 685784.37, "buy" : 684883.24, "sell" : 685784.37,  "symbol" : "$"},
  "CAD" : {"15m" : 1380.41, "last" : 1380.41, "buy" : 1378.6, "sell" : 1380.41,  "symbol" : "$"},
  "CNY" : {"15m" : 7131.48, "last" : 7131.48, "buy" : 7122.11, "sell" : 7131.48,  "symbol" : "¥"},
  "THB" : {"15m" : 35634.71, "last" : 35634.71, "buy" : 35587.88, "sell" : 35634.71,  "symbol" : "฿"},
  "AUD" : {"15m" : 1349.36, "last" : 1349.36, "buy" : 1347.58, "sell" : 1349.36,  "symbol" : "$"},
  "SGD" : {"15m" : 1443.9, "last" : 1443.9, "buy" : 1442.01, "sell" : 1443.9,  "symbol" : "$"},
  "KRW" : {"15m" : 1155773.33, "last" : 1155773.33, "buy" : 1154254.62, "sell" : 1155773.33,  "symbol" : "₩"},
  "JPY" : {"15m" : 115110.38, "last" : 115110.38, "buy" : 114959.12, "sell" : 115110.38,  "symbol" : "¥"},
  "PLN" : {"15m" : 4072.84, "last" : 4072.84, "buy" : 4067.49, "sell" : 4072.84,  "symbol" : "zł"},
  "GBP" : {"15m" : 832.11, "last" : 832.11, "buy" : 831.01, "sell" : 832.11,  "symbol" : "£"},
  "SEK" : {"15m" : 9212.32, "last" : 9212.32, "buy" : 9200.21, "sell" : 9212.32,  "symbol" : "kr"},
  "NZD" : {"15m" : 1474.6, "last" : 1474.6, "buy" : 1472.66, "sell" : 1474.6,  "symbol" : "$"},
  "BRL" : {"15m" : 3232.68, "last" : 3232.68, "buy" : 3228.43, "sell" : 3232.68,  "symbol" : "R$"},
  "RUB" : {"15m" : 58287.38, "last" : 58287.38, "buy" : 58210.79, "sell" : 58287.38,  "symbol" : "RUB"}

}

第二个 console.log 语句返回：

undefined

我尝试了什么： 我试图将在终端中获得的相同输出分配给 chrome 检查器中的变量并访问不同的对象只是为了测试我的语法是否正确。语法是正确的，我真的很困惑。

为什么我的第二个 console.log 语句未定义，我该如何解决这个问题才能在 USD 对象中获得“1500 万”价格？

Answer 1

您是否测试过区分大小写？ Javascript 区分大小写，因此您可能必须使用

console.log(body.USD);

用我的一些 json 对象对其进行了测试，它似乎可以这样工作

Answer 2

这里是你的代码修复：

let request = require('request');
let url = "https://blockchain.info/ticker"

request.get(url, function(error, response, body) {
    console.log(body); //first
    console.log(JSON.parse(body).USD); // second
});

请求以 JSON 形式返回响应。 您必须使用 JSON.parse 解析它才能检索 USD 属性。

输出

{
  "USD" : {"15m" : 1034.66, "last" : 1034.66, "buy" : 1033, "sell" : 1034.66,  "symbol" : "$"},
  "ISK" : {"15m" : 116053.35, "last" : 116053.35, "buy" : 115867.16, "sell" : 116053.35,  "symbol" : "kr"},
  "HKD" : {"15m" : 8040.9, "last" : 8040.9, "buy" : 8028, "sell" : 8040.9,  "symbol" : "$"},
  "TWD" : {"15m" : 31364.68, "last" : 31364.68, "buy" : 31314.36, "sell" : 31364.68,  "symbol" : "NT$"},
  "CHF" : {"15m" : 1030.56, "last" : 1030.56, "buy" : 1028.91, "sell" : 1030.56,  "symbol" : "CHF"},
  "EUR" : {"15m" : 963.59, "last" : 963.59, "buy" : 962.04, "sell" : 963.59,  "symbol" : "€"},
  "DKK" : {"15m" : 7168.31, "last" : 7168.31, "buy" : 7156.81, "sell" : 7168.31,  "symbol" : "kr"},
  "CLP" : {"15m" : 685565.72, "last" : 685565.72, "buy" : 684465.8, "sell" : 685565.72,  "symbol" : "$"},
  "CAD" : {"15m" : 1379.97, "last" : 1379.97, "buy" : 1377.76, "sell" : 1379.97,  "symbol" : "$"},
  "CNY" : {"15m" : 7129.21, "last" : 7129.21, "buy" : 7117.77, "sell" : 7129.21,  "symbol" : "¥"},
  "THB" : {"15m" : 35623.34, "last" : 35623.34, "buy" : 35566.19, "sell" : 35623.34,  "symbol" : "฿"},
  "AUD" : {"15m" : 1348.93, "last" : 1348.93, "buy" : 1346.76, "sell" : 1348.93,  "symbol" : "$"},
  "SGD" : {"15m" : 1443.44, "last" : 1443.44, "buy" : 1441.13, "sell" : 1443.44,  "symbol" : "$"},
  "KRW" : {"15m" : 1155404.82, "last" : 1155404.82, "buy" : 1153551.1, "sell" : 1155404.82,  "symbol" : "₩"},
  "JPY" : {"15m" : 115073.68, "last" : 115073.68, "buy" : 114889.05, "sell" : 115073.68,  "symbol" : "¥"},
  "PLN" : {"15m" : 4071.54, "last" : 4071.54, "buy" : 4065.01, "sell" : 4071.54,  "symbol" : "zł"},
  "GBP" : {"15m" : 831.84, "last" : 831.84, "buy" : 830.51, "sell" : 831.84,  "symbol" : "£"},
  "SEK" : {"15m" : 9209.38, "last" : 9209.38, "buy" : 9194.6, "sell" : 9209.38,  "symbol" : "kr"},
  "NZD" : {"15m" : 1474.13, "last" : 1474.13, "buy" : 1471.76, "sell" : 1474.13,  "symbol" : "$"},
  "BRL" : {"15m" : 3231.65, "last" : 3231.65, "buy" : 3226.47, "sell" : 3231.65,  "symbol" : "R$"},
  "RUB" : {"15m" : 58268.79, "last" : 58268.79, "buy" : 58175.31, "sell" : 58268.79,  "symbol" : "RUB"}

}
{ '15m': 1034.66,
  last: 1034.66,
  buy: 1033,
  sell: 1034.66,
  symbol: '$' }

Answer 3

对象中没有属性“usd”。请尝试以下操作：

console.log(body.USD);

Answer 4

console.log(body.USD);//区分大小写

Answer 5

实际上该属性是“美元”而不是美元。

试试这个

console.log(body); //first
    console.log(body.USD); //second