從JavaScript對象提取數據

Question

如何在下面的對象中將“匯率”值“ 18.52005000”分配給JavaScript變量？

{
    "Realtime Currency Exchange Rate": {
        "1. From_Currency_Code": "USD",
        "2. From_Currency_Name": "United States Dollar",
        "3. To_Currency Code": "MXN",
        "4. To_Currency_Name": "Mexican Peso",
        "5. Exchange Rate": "18.52005000",
        "6. Last Refreshed": "2018-02-17 12:53:11",
        "7. Time Zone": "UTC"
    }
}

我知道一些JavaScript-這個腳本是我與API進行接口以實現貨幣兌換率的，而我只需要比率部分即可完成其余的計算。

我正在做這樣的事情來創建對象：

var http_response = httpGet(query_url);
var http_response_json = JSON.parse(http_response);

謝謝！

Answer 1

如果您的Json結構位於變量“ test ”中，則請進行test["Realtime Currency Exchange Rate"]["5. Exchange Rate"]以訪問其值"18.52005000"

Answer 2

像這樣，我的好先生：

var rate = http_response_json['Realtime Currency Exchange Rate']['5. Exchange Rate']

Answer 3

您可以通過兩種方式訪問​​對象屬性：

1. object.prop
2. object['prop']

如果屬性名稱有問題或可變，則需要選擇2。

 var data = { "Realtime Currency Exchange Rate": { "1. From_Currency_Code": "USD", "2. From_Currency_Name": "United States Dollar", "3. To_Currency Code": "MXN", "4. To_Currency_Name": "Mexican Peso", "5. Exchange Rate": "18.52005000", "6. Last Refreshed": "2018-02-17 12:53:11", "7. Time Zone": "UTC" } } var rate = data["Realtime Currency Exchange Rate"]["5. Exchange Rate"] console.log(rate) 

Answer 4

在http_response_json獲取JSON對象后，就可以執行以下操作來獲取Exchange Rate的值

 var http_response_json = { "Realtime Currency Exchange Rate": { "1. From_Currency_Code": "USD", "2. From_Currency_Name": "United States Dollar", "3. To_Currency Code": "MXN", "4. To_Currency_Name": "Mexican Peso", "5. Exchange Rate": "18.52005000", "6. Last Refreshed": "2018-02-17 12:53:11", "7. Time Zone": "UTC" } }; var value = http_response_json["Realtime Currency Exchange Rate"]["5. Exchange Rate"]; console.log(value); 

Answer 5

var exchangeRate =  http_response_json["Realtime Currency Exchange Rate"]["5. Exchange Rate"];