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Build real-time stock quotes display based on JavaScript

PHPzOriginal: 2023-08-08 08:03:301339browse

Constructing real-time stock quotation display based on JavaScript

Introduction:
With the continuous development of financial markets, the display of real-time stock quotation is important for investors and traders Speaking becomes more and more important. In a modern trading platform, it is essential to provide a real-time stock price display function. This article will introduce how to use JavaScript and some related technologies to build a simple real-time stock quote display application.

Preparation
Before starting, you need to prepare the following work:
A web page framework based on HTML and CSS
An API for stock market data
JavaScript programming environment and corresponding libraries
Building a web page framework
First, we need to create a basic web page framework, including an area that displays stock quotes and corresponding CSS styles. The following is a simple example of a web page frame:

<!DOCTYPE html>
<html>
  <head>
    <title>实时股票行情展示</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div id="stock-info">
      <h1>股票行情</h1>
      <ul id="stock-list"></ul>
    </div>
    <script src="script.js"></script>
  </body>
</html>

In the above example, we have used a title and an unordered list tag to display stock quotes. CSS styles can be added by yourself to beautify the page.

Get stock market data
Next, we need to use a stock market data API to obtain real-time stock market information. Here we assume that we are using an API called "stock-api", which can return data in JSON format. We can use the fetch function in JavaScript to obtain this data.

fetch("https://api.stock-api.com/real-time")
  .then(response => response.json())
  .then(data => {
    // 处理返回的数据
  })
  .catch(error => {
    console.error("获取股票行情数据出错：", error);
  });

In the above code, we use the fetch function to send an HTTP request to obtain stock quotation data, and use the .then method to process the returned data.

Dynamic display of stock quotes
After obtaining the stock quotes data, we need to dynamically display it on the web page. The following is a sample code:

const stockListElement = document.getElementById("stock-list");

function displayStockInfo(stockData) {
  stockListElement.innerHTML = ""; // 清空原有的数据

  stockData.forEach(stock => {
    const liElement = document.createElement("li");
    liElement.innerHTML = `${stock.symbol}: ${stock.price}`;

    stockListElement.appendChild(liElement);
  });
}

// 在fetch成功后调用displayStockInfo函数
fetch("https://api.stock-api.com/real-time")
  .then(response => response.json())
  .then(data => {
    displayStockInfo(data);
  })
  .catch(error => {
    console.error("获取股票行情数据出错：", error);
  });

In the above code, we use the getElementById function to get the ul element that displays the stock quote, and then create the li element by traversing the stock data and add it to the ul element .

Update stock quotes in real time
To update stock quotes in real time, we can use a timer to regularly obtain the latest stock quotes data and update the display on the web page.

// 更新股票行情数据并动态展示
function updateStockInfo() {
  fetch("https://api.stock-api.com/real-time")
    .then(response => response.json())
    .then(data => {
      displayStockInfo(data);
    })
    .catch(error => {
      console.error("获取股票行情数据出错：", error);
    });
}

// 每5秒钟更新一次股票行情数据
setInterval(updateStockInfo, 5000);

In the above code, we use the setInterval function to call the updateStockInfo function every 5 seconds to update the stock market data and page display.

Summary:
Through the above steps, we used JavaScript and some related technologies to build a simple real-time stock quotation display application. In practical applications, we can customize different display methods and styles according to needs, and we can also add some interactive functions, such as clicking on stock quotes for in-depth viewing. I hope this article can provide some reference and help for readers to build real-time stock quotation display applications.

（Word count: 800 words）

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