如何计算从 Binance Websocket Java Script 获得的买入价和卖出价答案

【问题标题】：How Can I Do Calculation in Bid And Ask Price which I am getting From Binance Websocket Java Script如何计算从 Binance Websocket Java Script 获得的买入价和卖出价
【发布时间】：2022-01-02 11:38:57
【问题描述】：

我正在获取 Btc 期货买价和买价以及 Btc 现货卖价和买价的实时价格我想从 Btc 期货买价（即点差）中减去 Btc 现货卖价。我也将它们转换为 Float 但在控制台中我得到 NaN

let btcspotws = new WebSocket('wss://stream.binance.com:9443/ws/btcusdt@bookTicker');
let btcspotbidElement = document.getElementById('btcspot-bid');
let btcspotaskElement = document.getElementById('btcspot-ask');

var btcspotask
var btcfut1ask
btcspotws.onmessage = (event) => {
    //console.log(event.data);

    let btcspotobject = JSON.parse(event.data);

    let btcspotbid = parseFloat(btcspotobject.b).toFixed(2);
    btcspotbidElement.innerText = btcspotbid;

    let btcspotask = parseFloat(btcspotobject.a).toFixed(2);
    btcspotaskElement.innerText = btcspotask;
};

let btcfut1ws = new WebSocket('wss://dstream.binance.com/stream?streams=btcusd_220325@bookTicker');
let btcfut1bidElement = document.getElementById('btcfut1-bid');
let btcfut1askElement = document.getElementById('btcfut1-ask');

btcfut1ws.onmessage = (event) => {
    //console.log(event.data);

    let btcfut1object = JSON.parse(event.data);

    let btcfut1bid = parseFloat(btcfut1object.data.b).toFixed(2);
    btcfut1bidElement.innerText = btcfut1bid;

    let btcfut1ask = parseFloat(btcfut1object.data.a).toFixed(2);
    btcfut1askElement.innerText = btcfut1ask;
    
};

console.log(btcspotaskElement - btcfut1bidElement)

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Live Crypto Price</title>

  <link rel="preconnect" href="https://fonts.gstatic.com">
  <link href="https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300&display=swap" rel="stylesheet">

  <link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
  <link rel="icon" href="favicon.ico" type="image/x-icon">

  <link rel="stylesheet" href="style.css">
</head>

<body>

  <table style="width:70%">
    <tr>
      <th>BTC</th>
      <th>Ask</th>
      <th>Bid</th>
      <th>Spread</th>
    </tr>
    <tr>
      <td><b>BTC/USDT</b></td>
      <td id="btcspot-ask">Loading...</td>
      <td id="btcspot-bid">Loading...</td>
      <td>-</td>
    </tr>
    <tr>
      <td><b>BTC USD 25 Mar</b></td>
      <td id="btcfut1-ask">Loading...</td>
      <td id="btcfut1-bid">Loading...</td>
      <td id="btc-spread">Loading...</td>
    </tr>
  </table>


  </div>

  <script src="app.js"></script>
</body>

</html>

【问题讨论】：

标签： javascript binance

【解决方案1】：

你很接近，我对你的sn-p做了一些调整：

let btcspotbidElement = document.getElementById('btcspot-bid');
let btcspotaskElement = document.getElementById('btcspot-ask');
let btcfut1bidElement = document.getElementById('btcfut1-bid');
let btcfut1askElement = document.getElementById('btcfut1-ask');
let btcspreadElement = document.getElementById('btc-spread');

let btcspotask;
let btcspotbid;
let btcfut1ask;
let btcfut1bid;

let btcspotws = new WebSocket('wss://stream.binance.com:9443/ws/btcusdt@bookTicker');
btcspotws.onmessage = (event) => {
    let btcspotobject = JSON.parse(event.data);
    btcspotbid = parseFloat(btcspotobject.b).toFixed(2);
    btcspotbidElement.innerText = btcspotbid;
    btcspotask = parseFloat(btcspotobject.a).toFixed(2);
    btcspotaskElement.innerText = btcspotask;
};

let btcfut1ws = new WebSocket('wss://dstream.binance.com/stream?streams=btcusd_220325@bookTicker');
btcfut1ws.onmessage = (event) => {
    let btcfut1object = JSON.parse(event.data);
    btcfut1bid = parseFloat(btcfut1object.data.b).toFixed(2);
    btcfut1bidElement.innerText = btcfut1bid;
    btcfut1ask = parseFloat(btcfut1object.data.a).toFixed(2);
    btcfut1askElement.innerText = btcfut1ask;

    // Here you can display the spread:
    btcspreadElement.innerText = parseFloat(btcspotask-btcfut1bid).toFixed(2);
};

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Live Crypto Price</title>

  <link rel="preconnect" href="https://fonts.gstatic.com">
  <link href="https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300&display=swap" rel="stylesheet">

  <link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
  <link rel="icon" href="favicon.ico" type="image/x-icon">

  <link rel="stylesheet" href="style.css">
</head>

<body>

  <table style="width:70%">
    <tr>
      <th>BTC</th>
      <th>Ask</th>
      <th>Bid</th>
      <th>Spread</th>
    </tr>
    <tr>
      <td><b>BTC/USDT</b></td>
      <td id="btcspot-ask">Loading...</td>
      <td id="btcspot-bid">Loading...</td>
      <td>-</td>
    </tr>
    <tr>
      <td><b>BTC USD 25 Mar</b></td>
      <td id="btcfut1-ask">Loading...</td>
      <td id="btcfut1-bid">Loading...</td>
      <td id="btc-spread">Loading...</td>
    </tr>
  </table>


  </div>

  <script src="app.js"></script>
</body>

</html>

【讨论】：

兄弟你是最好的你解决了我从 2 天开始面临的问题