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How to implement instant messaging on the front end

Methods for implementing instant messaging include WebSocket, Long Polling, Server-Sent Events, WebRTC, etc. Detailed introduction: 1. WebSocket, which can establish a persistent connection between the client and the server to achieve real-time two-way communication. The front end can use the WebSocket API to create a WebSocket connection and achieve instant messaging by sending and receiving messages; 2. Long Polling is a technology that simulates real-time communication and more.