Question

我正在使用Coindesk JSON API获取最新的比特币汇率。

http://api.coindesk.com/v1/bpi/currentprice/GBP.json

我想在我网站的页面上以纯文本显示汇率，例如：“284.0493”。从JSON数组中提取正确值并将其显示在HTML div中的正确方法是什么？

使用JavaScript，PHP甚至Python的任何解决方案都可以。

到目前为止，我一直在this工作。

谢谢！

Answer 1

首先，所讨论的json数据不是数组而是对象！

可视化任何json数据的一种简单方法是执行此操作

<?php
$j = '{"time":{"updated":"Oct 26, 2015 12:54:00 UTC","updatedISO":"2015-10-26T12:54:00+00:00","updateduk":"Oct 26, 2015 at 12:54 GMT"},"disclaimer":"This data was produced from the CoinDesk Bitcoin Price Index (USD). Non-USD currency data converted using hourly conversion rate from openexchangerates.org","bpi":{"USD":{"code":"USD","rate":"283.9203","description":"United States Dollar","rate_float":283.9203},"GBP":{"code":"GBP","rate":"185.0732","description":"British Pound Sterling","rate_float":185.0732}}}';

print_r( json_decode($j) );

在这种情况下会产生： -

stdClass Object
(
    [time] => stdClass Object
        (
            [updated] => Oct 26, 2015 12:54:00 UTC
            [updatedISO] => 2015-10-26T12:54:00+00:00
            [updateduk] => Oct 26, 2015 at 12:54 GMT
        )

    [disclaimer] => This data was produced from the CoinDesk Bitcoin Price Index (USD). Non-USD currency data converted using hourly conversion rate from openexchang
erates.org
    [bpi] => stdClass Object
        (
            [USD] => stdClass Object
                (
                    [code] => USD
                    [rate] => 283.9203
                    [description] => United States Dollar
                    [rate_float] => 283.9203
                )

            [GBP] => stdClass Object
                (
                    [code] => GBP
                    [rate] => 185.0732
                    [description] => British Pound Sterling
                    [rate_float] => 185.0732
                )

        )

)

这非常简单地告诉你a）它的对象具有属性也是对象等等，以及b）如何引用对象中的任何属性。

所以为了得到你想要的汇率我会做： -

<?php
$j = '{"time":{"updated":"Oct 26, 2015 12:54:00 UTC","updatedISO":"2015-10-26T12:54:00+00:00","updateduk":"Oct 26, 2015 at 12:54 GMT"},"disclaimer":"This data was produced from the CoinDesk Bitcoin Price Index (USD). Non-USD currency data converted using hourly conversion rate from openexchangerates.org","bpi":{"USD":{"code":"USD","rate":"283.9203","description":"United States Dollar","rate_float":283.9203},"GBP":{"code":"GBP","rate":"185.0732","description":"British Pound Sterling","rate_float":185.0732}}}';

$bitExchange = json_decode($j);

// the GBP exchange rate will be
echo $bitExchange->bpi->GBP->rate;
// or if you prefer
echo $bitExchange->bpi->GBP->rate_float;

Answer 2

假设json数据存储在python中的json_text中，您可以执行

import json
json.loads(json_text).get('bpi').get('USD').get('rate')

如果数据对您至关重要，则应检查错误。此外，使货币可配置可能是个好主意。

从JSON数组中提取和显示值

2 个答案: