socket.io + nodejs实现聊天室

双俊人

2023-12-01

socket.io 也能做聊天室，并且据说比websocket 更简便，至于真假就见仁见智了，还是先放代码

前端：

<!DOCTYPE html>
<html>
  <head>
    <title>Socket.IO chat</title>
    <style>
      body { margin: 0; padding-bottom: 3rem; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }

      #form { background: rgba(0, 0, 0, 0.15); padding: 0.25rem; position: fixed; bottom: 0; left: 0; right: 0; display: flex; height: 3rem; box-sizing: border-box; backdrop-filter: blur(10px); }
      #input { border: none; padding: 0 1rem; flex-grow: 1; border-radius: 2rem; margin: 0.25rem; }
      #input:focus { outline: none; }
      #form > button { background: #333; border: none; padding: 0 1rem; margin: 0.25rem; border-radius: 3px; outline: none; color: #fff; }

      #messages { list-style-type: none; margin: 0; padding: 0; }
      #messages > li { padding: 0.5rem 1rem; }
      #messages > li:nth-child(odd) { background: #efefef; }
    </style>
  </head>
  <body>
    <ul id="messages"></ul>
    <form id="form" action="">
      <input id="input" autocomplete="off" /><button>Send</button>
    </form>
    <script src="/socket.io/socket.io.js"></script>
        <script>
        var socket = io();

        var messages = document.getElementById('messages');
        var form = document.getElementById('form');
        var input = document.getElementById('input');

        form.addEventListener('submit', function(e) {
            e.preventDefault();
            if (input.value) {
            socket.emit('chat message', input.value);
            input.value = '';
            }
        });

        socket.on('chat message', function(msg) {
            var item = document.createElement('li');
            item.textContent = msg;
            messages.appendChild(item);
            window.scrollTo(0, document.body.scrollHeight);
        });
        </script>


  </body>
</html>

后端：

const express = require('express');
const app = express();
const http = require('http');
const server = http.createServer(app);
const { Server } = require("socket.io");
const io = new Server(server);

app.get('/', (req, res) => {
  res.sendFile(__dirname + '/index.html');
});

io.on('connection', (socket) => {
    socket.on('chat message', (msg) => {
      io.emit('chat message', msg);
    });
  });
server.listen(3000, () => {
  console.log('listening on *:3000');
});

为了使用socket.io，需要npm install socket.io, 还有express@4

socket 表示用户的连接
socket.on 表示注册某个事件如果需要获取浏览器数据需要注册一个事件等待浏览器触发
socket.emit 表示触发某个事件如果需要给浏览器发送数据需要触发浏览器注册的某个事件

socket.io + nodejs实现聊天室

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