Node.js socket.io前端后端通讯简单例子

前端代码：

    



    

    

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后端代码：

var express = require('express');
var app = express();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var path = require('path');
app.use(express.static(__dirname));
app.get('/', function (request, response) {
    response.sendFile(path.join(__dirname, 'index.html'));
});

io.on('connection', function (socket) {
    console.log('a user connected');
    socket.on('disconnect', function () {
        console.log('user disconnected');
    });
    socket.on('message', function (message) {
        console.log('message: ' + message);
        io.emit('message', message);
    });
});

var server = http.listen(4000, function () {
    console.log('Sever is running');
});