Nodejs返回Blockchain Rates API的完整JSON，但是我不能访问它里面的特定对象。 为什么？

我有一个文件，请求blockchain.info/ticker API，以拉比特币的最新价格。

的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 

我试过的是什么：我试图将我在terminal中得到的输出分配给一个铬检查器中的variables，并访问不同的对象来testing我的语法是否正确。 语法是正确的，所以我真的很困惑。

为什么我的第二个console.log语句未定义，我如何解决这个问题，以获得美元对象内的“15米”价格？

Answer 1

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JSONforms返回响应。 您必须使用JSON.parseparsing它才能检索USD属性。

产量

 { "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 2

你testing过大小写吗？ Javascript是区分大小写的，所以你可能不得不使用

 console.log(body.USD); 

用我的一些json对象进行testing，似乎是这样工作的

Answer 3

对象中没有“usd”属性。 尝试以下操作：

 console.log(body.USD); 

Answer 4

console.log(body.USD); //区分大小写

Answer 5

其实财产是“美元”而不是美元。

试试这个

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