目标
用户与服务端建立通信，服务端能检测到用户端的连接信息
代码
- JS部分<
chatroom.js>
const express = require('express')
const http = require('http')
const {Server} = require('socket.io')const app = express()
const server = http.createServer(app)
const io = new Server(server) \\不要写错app.use(express.static(__dirname)) \\静态托管必须要写
io.on('connect',(socket)=>{console.log('an user connected')socket.on('disconnect',()=>{console.log("an user disconnected")})
})const port =3001
server.listen(port,()=>{console.log(`server is running at http://localhost:${port}`)\\反引号字符串模板
})
- Html部分<
index.html>
<!DOCTYPE html>
<html><head><script src="/socket.io/socket.io.js"></script>\\不能遗漏，这里是让浏览器提前加载socket.io库</head><body><h1>Chat Room</h1><input id="inputtext" placeholder="Enter your message"><button id="inputbtn">Send</button><script>const socket = io()\\浏览器与服务端建立连接的关键</script></body>
</html>
效果
- JS部分
输入node chatroom.js运行
- Html部分
