socket.io基本使用(express框架)

Server

const express = require("express");
const app = express();
const http = require("http").createServer(app);
const io = require("socket.io")(http);

io.on("connection", socket => {  // 客戶端連接成功

    socket.on("監聽頻道", msg => {  // 監聽的頻道必須和客戶端監聽的頻道相同，等待消息
        io.emit("監聽頻道", "發送的信息");  // 向全部客戶端發送信息
    });

    io.on("disconnect", _ => {  // 客戶端斷開連接
        ...
    });

});

http.listen(3000, _ => {
    console.log("server running on 3000");
});

Client

const io = io("url");
    io.emit("監聽頻道", "發送的信息");
    io.on("監聽頻道", msg => {  // 監聽頻道，等待消息

    });