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采用nodejs + socket.io实现简易聊天室功能（群聊 + 私聊）

news 2025/8/13 14:57:32

项目演示

支持群聊以及私聊
在这里插入图片描述

项目代码

index.html

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><script src="/socket.io/socket.io.js"></script><style>.box {display: flex;justify-content: space-between;width: 800px;margin: 50px auto;text-align: center;}.box>div {flex: 1;}.box .center {flex: 2;}.box .center input {width: 70%;}.list {list-style: none;text-align: left;}</style>
</head><body><div class="box"><div class="left"><div class="num">在线人数：1</div></div><div class="center"><h1 style="margin-bottom: 20px;">简易聊天室</h1><!-- 输入框 --><input type="text" class="ipt"><!-- 发送 --><button class="btn">发送消息</button><!-- 输入框 --><input type="text" class="joinNum"><!-- 加入房间 --><button class="joinBtn">加入房间</button><ul class="list" style="margin-top: 40px;"><!-- <li class="list-group-item">An item</li> --></ul></div><div class="right"><!-- <div>xxx已进入</div> --></div></div><script>let num = document.querySelector('.num')let ipt = document.querySelector('.ipt')let btn = document.querySelector('.btn')let joinNum = document.querySelector('.joinNum')let joinBtn = document.querySelector('.joinBtn')let list = document.querySelector('.list')let left = document.querySelector('.left')let center = document.querySelector('.center')let right = document.querySelector('.right')let socket = io()const name = prompt('请输入你的名称：')//把用户名称传递给服务端socket.emit('join', name)// 监听用户已进入 | 已退出socket.on('join', (obj) => {right.innerHTML += `<div>${obj.name} ${obj.status}</div>`})// 监听用户在线人数socket.on('userNum', (n) => {num.innerHTML = `在线人数：${n} 个人`})// 点击发送按钮 发送消息btn.addEventListener('click', function () {// 将数据传递给服务端socket.emit('value', ipt.value)})// 键盘按下回车 发送消息ipt.addEventListener('keydown', function (e) {if (e.key !== 'Enter') return// 将数据传递给服务端socket.emit('value', ipt.value)})// 加入房间joinBtn.addEventListener('click', function () {socket.emit("joinRoom", { room: joinNum.value, value: ipt.value })})// 服务端再把数据响应回来socket.on('value', (value) => {list.innerHTML += `<li>${value}</li>`ipt.value = ''})</script>
</body></html>

index.js

const app = require("express")();
const http = require("http").Server(app);
const io = require("socket.io")(http);app.get("/", (req, res) => {res.sendFile(__dirname + "/index.html");
});let userNum = 0; //当前在线人数io.on("connection", (socket) => {// 访问聊天室用户在线输了加1++userNum;// 将用户在线数量实时同步给客户端io.emit("userNum", userNum);// 相应客户端传递的数据socket.on("value", (value) => {io.emit("value", `${socket.username}：${value}`);});// 监听用户进入聊天室socket.on("join", (name) => {socket.username = name;io.emit("join", {name: name,status: "已进入",});});// 离开聊天室用户在线数量减1socket.on("disconnect", () => {--userNum;io.emit("userNum", userNum);io.emit("join", {name: socket.username,status: "已退出",});});// 加入房间socket.on("joinRoom", ({ room, value }) => {// 加入指定的房间socket.join(room);// 在指定房间中发送消息io.to(room).emit("value", `${socket.username}：${value}`);});
});http.listen(1231, () => {console.log("服务器已启动：http://localhost:1231");
});

package.json

{"name": "WebSocket","version": "1.0.0","main": "index.js","scripts": {"start": "node index.js"},"license": "MIT","dependencies": {"express": "^4.18.2","socket.io": "^4.5.4"}
}