JavaScript jQuery货币换算数学题

Question

我正在使用在线货币转换器。 基本转换卡在欧元上，这意味着我在用欧元兑换时会得到特定货币的转换率。

例如：

1 欧元 = 1.2nn 美元。

如何使用此 output 将其更改为 USD 作为基础 output？

这是来自在线货币转换器的 json output：

{"success":true,"timestamp":1613901367,"base":"EUR","date":"2021-02-21","rates":{"AED":4.45116,"AFN":93.99,"ALL":123.72,"AMD":635.578463,"ANG":2.1788,"AOA":790.667826,"ARS":108.0972,"AUD":1.539803,"AWG":2.181285,"AZN":2.064913,"BAM":1.95583,"BBD":2.4508,"BDT":102.7685,"BGN":1.9559,"BHD":0.457,"BIF":2359.519995,"BMD":1.211825,"BND":1.6071,"BOB":8.3936,"BRL":6.523138,"BSD":1.2138,"BTC":2.1418808e-5,"BTN":88.0211,"BWP":13.151,"BYN":3.1438,"BYR":23751.769953,"BZD":2.4467,"CAD":1.528778,"CDF":2396.388683,"CHF":1.086092,"CLF":0.031122,"CLP":858.760264,"CNY":7.860871,"COP":4305.799991,"CRC":742.739999,"CUC":1.211825,"CUP":32.113362,"CVE":110.265,"CZK":25.89155,"DJF":216.09,"DKK":7.43649,"DOP":70.293,"DZD":160.694103,"EGP":18.954,"ERN":18.177809,"ETB":48.8765,"EUR":1,"FJD":2.455097,"FKP":0.864755,"GBP":0.86457,"GEL":4.011614,"GGP":0.864755,"GHS":7.0098,"GIP":0.864755,"GMD":62.348868,"GNF":12314.299975,"GTQ":9.3707,"GYD":253.949999,"HKD":9.395527,"HNL":29.251,"HRK":7.570882,"HTG":88.522,"HUF":358.451823,"IDR":17045.999966,"ILS":3.963928,"IMP":0.864755,"INR":87.923119,"IQD":1770.969996,"IRR":51023.89195,"ISK":155.602954,"JEP":0.864755,"JMD":182.978,"JOD":0.858341,"JPY":127.873596,"KES":133.1593,"KGS":102.562857,"KHR":4937.79999,"KMF":492.49028,"KPW":1090.642049,"KRW":1340.327385,"KWD":0.366703,"KYD":1.0116,"KZT":506.699999,"LAK":11340.799977,"LBP":1835.499996,"LKR":237.3028,"LRD":209.646147,"LSL":17.802172,"LTL":3.578205,"LVL":0.733021,"LYD":5.4041,"MAD":10.8062,"MDL":21.3451,"MGA":4575.569991,"MKD":61.615,"MMK":1711.493497,"MNT":3460.137548,"MOP":9.6935,"MRO":432.621316,"MUR":48.17,"MVR":18.666638,"MWK":945.162998,"MXN":24.75421,"MYR":4.894608,"MZN":90.996397,"NAD":17.802166,"NGN":461.705741,"NIO":42.362,"NOK":10.256649,"NPR":140.834,"NZD":1.658558,"OMR":0.46658,"PAB":1.2139,"PEN":4.4329,"PGK":4.3166,"PHP":58.765,"PKR":193.1196,"PLN":4.48509,"PYG":8071.099984,"QAR":4.412301,"RON":4.87643,"RSD":117.56,"RUB":89.71751,"RWF":1205.469998,"SAR":4.544348,"SBD":9.702984,"SCR":26.056,"SDG":66.983673,"SEK":10.031856,"SGD":1.6064,"SHP":0.864755,"SLL":12378.792761,"SOS":710.129859,"SRD":17.152217,"STD":24578.396965,"SVC":10.622,"SYP":621.394433,"SZL":17.808,"THB":36.336619,"TJS":13.8315,"TMT":4.241387,"TND":3.280456,"TOP":2.790353,"TRY":8.43879,"TTD":8.2351,"TWD":33.844944,"TZS":2814.859994,"UAH":33.8042,"UGX":4452.299991,"USD":1.211825,"UYU":51.976,"UZS":12784.009975,"VEF":12.103107,"VND":27941.999944,"VUV":130.026527,"WST":3.060192,"XAF":655.956999,"XAG":0.044427,"XAU":0.000679,"XCD":3.275018,"XDR":0.8432,"XOF":655.956999,"XPF":119.546977,"YER":303.410729,"ZAR":17.756878,"ZMK":10907.883522,"ZMW":26.2975,"ZWL":390.208051}}

我希望汇率以美元为基础 output：

IE：1 美元 = 0.82nn 欧元，nn ZAR，nn 其他货币。

可以使用这个 output 进行转换吗？

Answer 1

如果要将 json 从 EURO 修改为 USD：

 var s = '{"success":true,"timestamp":1613901367,"base":"EUR","date":"2021-02-21","rates":{"AED":4.45116,"AFN":93.99,"ALL":123.72,"AMD":635.578463,"ANG":2.1788, "EUR": 1, "USD": 1.211825}}'; var t = JSON.parse(s); var rates = t['rates']; var base = t['base'] var result = convertTo('USD'); console.log(result); function convertTo(devise){ var v = rates[base] / rates[devise]; for (const key in rates) { t['rates'][key] *= v; } t['base']=devise; return JSON.stringify(t); }

Answer 2

尝试从转换器获取美元的兑换率，因为兑换率是根据货币对货币的水平确定的。