Socket.io的简单连接

首先在服务端下载依赖
npm install socket.io@2.0.4 socket.io版本过高会出现问题
npm install express

const express = require('express');
const app = express();
const server = require('http').Server(app);
const ws = require('socket.io')(server);
//将socket 服务器和express进行结合 这样就不用起两个服务了

app.use(express.static(__dirname + './client'))

//客户端连接
ws.on('connection',function(client){
    client.emit('hehe','欢迎光临 socket.io')  //emit 触发客户端注册的hehe事件 必须对应
    client.on('haha',(msg)=>{
		console.log(msg)
		})
})

server.listen(8081, '192.168.1.19');//如果是'0.0.0.0'允许所以端口访问

客户端
首先要引用客户端所需要的js文件
链接服务器这里用的不是WebSocket协议，用的是http协议
WebSocket的传值是通过onmessage和message来实现的
socket.io是通过emit事件

<!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="./node_modules/socket.io-client/dist/socket.io.js"></script>
</head>
<body>

    <script>
           var socket = io.connect('http://192.168.1.19:8081');
           //链接服务器
           socket.on('hehe',function(msg){ 
               console.log(msg) 
           })
           socket.emit('haha', '你好啊')
    </script>
</body>
</html>