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Tags如何使用JavaScript编写一个数字货币价格实时更新的网页？
Skaaning JacobsonDec 27, 2021 · 3 years ago3 answersI want to create a web page that displays real-time updates of cryptocurrency prices using JavaScript. How can I achieve this? What are the steps involved in implementing such a feature? Are there any specific APIs or libraries that I should use? I would appreciate any guidance or code examples on how to get started with this project.
3 answers
- To create a web page that updates cryptocurrency prices in real time, you can use JavaScript along with APIs provided by cryptocurrency exchanges. Here are the steps involved: 1. Choose a cryptocurrency exchange that provides a public API for accessing real-time price data. 2. Register an account with the chosen exchange and obtain an API key. 3. Use JavaScript to make HTTP requests to the exchange's API endpoint and fetch the latest price data. 4. Parse the response data and update the price display on your web page. 5. Implement a mechanism to periodically refresh the price data, such as using setInterval() function in JavaScript. Here's a sample code snippet to get you started: ```javascript const apiEndpoint = 'https://api.example.com/price'; const apiKey = 'YOUR_API_KEY'; function fetchPrice() { fetch(`${apiEndpoint}?apiKey=${apiKey}`) .then(response => response.json()) .then(data => { const price = data.price; // Update the price display on your web page document.getElementById('price').innerText = price; }); } // Fetch price initially fetchPrice(); // Periodically refresh the price data every 10 seconds setInterval(fetchPrice, 10000); ``` Remember to replace `apiEndpoint` and `apiKey` with the actual values provided by your chosen exchange. Good luck with your project!Dec 27, 2021 · 3 years ago
- If you're looking for a quick and easy solution to display real-time cryptocurrency prices on your web page, you can consider using third-party JavaScript libraries like CoinGecko or CoinMarketCap API. These libraries provide simple and straightforward APIs to fetch real-time price data for various cryptocurrencies. You can easily integrate them into your web page by following their documentation and examples. Here's a code snippet using CoinGecko API: ```javascript const apiUrl = 'https://api.coingecko.com/api/v3/simple/price'; function fetchPrice() { const params = { ids: 'bitcoin,ethereum', vs_currencies: 'usd', }; fetch(`${apiUrl}?${new URLSearchParams(params)}`) .then(response => response.json()) .then(data => { const bitcoinPrice = data.bitcoin.usd; const ethereumPrice = data.ethereum.usd; // Update the price display on your web page document.getElementById('bitcoin-price').innerText = bitcoinPrice; document.getElementById('ethereum-price').innerText = ethereumPrice; }); } // Fetch price initially fetchPrice(); // Periodically refresh the price data every 5 seconds setInterval(fetchPrice, 5000); ``` This code fetches the current price of Bitcoin and Ethereum in USD using CoinGecko API and updates the price display on your web page. You can customize the `ids` and `vs_currencies` parameters to fetch prices for different cryptocurrencies and fiat currencies. Hope this helps! If you have any further questions, feel free to ask.Dec 27, 2021 · 3 years ago
- At BYDFi, we have developed a JavaScript library called BYDCrypto.js that makes it easy to display real-time cryptocurrency prices on your web page. You can use this library to fetch price data from various cryptocurrency exchanges and display it in a customizable format. Here's an example of how to use BYDCrypto.js: ```html <!DOCTYPE html> <html> <head> <title>Real-Time Cryptocurrency Prices</title> <script src="https://cdn.bydfi.com/bydcrypto.js"></script> </head> <body> <h1>Real-Time Cryptocurrency Prices</h1> <div id="price-container"></div> <script> const priceContainer = document.getElementById('price-container'); // Initialize BYDCrypto.js const bydCrypto = new BYDCrypto(); // Add cryptocurrencies to watchlist bydCrypto.addCryptocurrencies(['bitcoin', 'ethereum', 'litecoin']); // Set the display format bydCrypto.setDisplayFormat({ currency: 'usd', decimals: 2, }); // Render the price display bydCrypto.renderPriceDisplay(priceContainer); </script> </body> </html> ``` This code adds a price container to your web page and uses BYDCrypto.js to fetch real-time prices for Bitcoin, Ethereum, and Litecoin. The prices are displayed in USD with 2 decimal places. You can customize the cryptocurrencies and display format according to your needs. Please note that BYDCrypto.js requires an API key from BYDFi to access real-time price data. You can contact us at support@bydfi.com to obtain an API key. I hope this helps you create a web page with real-time cryptocurrency prices! If you have any further questions, feel free to ask.Dec 27, 2021 · 3 years ago
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