Question

如何将下面对象中的“18.52005000”的“汇率”值分配给JavaScript变量？

{
    "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"
    }
}

我知道一点JavaScript - 一个脚本，我使用API进行货币转换率的接口，我只需要费率部分来完成其余的计算。

我正在做这样的事情来创建对象：

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

谢谢！

Answer 1

如果您的Json结构位于变量＆＃34; test＆＃34;，则执行test["Realtime Currency Exchange Rate"]["5. Exchange Rate"]以访问其值"18.52005000"

Answer 2

像这样，我的好先生：

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

Answer 3

您可以通过两种方式访问对象属性：

object.prop
object['prop']

如果存在有问题或可变的属性名称，则需要选择2。

＆＃13;

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)

＆＃13;

Answer 4

在http_response_json中获得JSON对象之后，您可以执行类似这样的操作来获取Exchange Rate

的值

＆＃13;

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);

＆＃13;

Answer 5

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

从JavaScript对象中提取数据

5 个答案: