JavaScript and WebSocket: Building an efficient real-time trading system

JavaScript is a scripting language widely used in web development, while WebSocket is a protocol that can achieve real-time communication in web pages. Using JavaScript and WebSocket together can create an efficient real-time trading system. This article will introduce the basic concepts of JavaScript and WebSocket and provide some concrete code examples.

1. Introduction to JavaScript

JavaScript was originally developed by Netscape and later standardized by ECMA (European Computer Manufacturers Association) and became part of the ECMAScript standard. Today, JavaScript is widely used in web development and can implement various interactive functions in web pages.

JavaScript has the following characteristics:

1. Script language: JavaScript is a script language that is interpreted and executed. It does not need to be compiled into machine language and can be executed directly in the browser.
2. Object-oriented: JavaScript supports object-oriented programming, which can implement complex functions by defining objects and their properties and methods.
3. Client-side scripting language: JavaScript mainly runs in the client browser to interact with web pages.
4. Weakly typed language: JavaScript is a weakly typed language that does not require explicit declaration of variable types.

2. Introduction to WebSocket

WebSocket is a full-duplex communication protocol based on the TCP protocol. Compared with the HTTP protocol, WebSocket has the following characteristics:

1. Real-time: WebSocket allows the server to actively push data to the client to achieve real-time communication.
2. Two-way communication: WebSocket can send and receive data at the same time to achieve two-way communication.
3. Smaller data transmission volume: Compared with HTTP, WebSocket only requires a few bytes of overhead in the header of each message, reducing the burden of data transmission.

Using WebSocket requires the following steps:

1. Create a WebSocket object: Create a WebSocket object through the WebSocket class in JavaScript.
2. Establish a connection: Call the open method of the WebSocket object to establish a connection with the server.
3. Sending and receiving data: Send data through the send method of the WebSocket object, and receive data by listening to the message event of the WebSocket object.
4. Close the connection: Call the close method of the WebSocket object to close the connection.

3. JavaScript and WebSocket implement real-time trading system

The following is a simple sample code for JavaScript and WebSocket to implement real-time trading system:

// 创建WebSocket对象
var socket = new WebSocket("ws://localhost:8080");

// 建立连接
socket.onopen = function() {
  console.log("WebSocket连接已建立");
};

// 发送数据
socket.send("Hello Server!");

// 接收数据
socket.onmessage = function(event) {
  console.log("接收到的数据：" + event.data);
};

// 关闭连接
socket.onclose = function(event) {
  console.log("WebSocket连接已关闭，关闭代码：" + event.code);
};

In the above example , we created a WebSocket object and established a connection to the server by specifying the server address. Then use the send method to send data to the server, and receive the data sent by the server by listening to the message event. Finally, close the connection to the server through the close method.

You can add more functional codes based on the above examples according to specific needs, such as processing transaction data, updating transaction information, etc. In this way, an efficient real-time trading system can be built based on JavaScript and WebSocket.

Summary:

This article introduces the basic concepts of JavaScript and WebSocket, and provides a simple code example showing how to use JavaScript and WebSocket to build an efficient real-time trading system. Using JavaScript and WebSocket can realize real-time communication, two-way communication and other functions, providing a convenient and efficient solution for the development of trading systems.

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