如何将我现有的脚本转换为一个请求解决方案＆＃34; （API）

Question

  

通过API计算比特币价格的实际RSI（相对强弱指数）：

我的脚本目前向API发出14个单独请求，以计算比特币的实际RSI。现在我找到了一个请求，我只需要向API发出一个请求。

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https://min-api.cryptocompare.com/data/histoday?fsym=BTC&tsym=USD&limit=14

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将新API集成到现有脚本中需要做什么？我只想向API提出一个请求。

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// Create a url for currencies + date
const getURL = (currencyFrom, currencyTo, timestamp) => 
  `https://min-api.cryptocompare.com/data/pricehistorical?fsym=${currencyFrom}&tsyms=${currencyTo}&ts=${timestamp}`;

// Get a timestamp from exactly x days ago
const timeStampForDaysAgo = 
	nrOfDays => Date.now() - 1000 * 60 * 60 * 24 * nrOfDays;

const getBTCDollarValueForDays = nrOfDays => Promise
  .all(Array.from(
      	Array(nrOfDays),
        (_, i) => 
        	fetch(getURL("BTC", "USD", timeStampForDaysAgo(i)))
            .then(r => r.json()))
  );

const getDollarValueFromResponse = obj => obj.BTC.USD;

// Main:
getBTCDollarValueForDays(14)
  .then(vals => vals.map(getDollarValueFromResponse))
  .then(calcRSI)
  .then(console.log.bind(console, "RSI is:"));
  
  
function calcRSI(xs) {
  let sumGain = 0;
  let sumLoss = 0;
  const TOLERANCE = 50;
  
  for (let i = 1; 
  		i < xs.length; 
  		i += 1) {
  	const curr = xs[i];
    const prev = xs[i - 1]
    const diff = curr - prev;
    
    if (diff >= 0) {
      sumGain += diff;
    } else {
      sumLoss -= diff;
    }
  }
  
  if (sumGain === 0) return 0;
  if (Math.abs(sumLoss) < TOLERANCE) return 100;
  
  const relStrength = sumGain / sumLoss;
  
  return 100 - (100 / (1 + relStrength));
};

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