socket.io学习记录

基础看这里 WebSocket 教程

https://socket.io/docs/
https://segmentfault.com/a/11...
用Socket.io打造协作应用

Installing

$ npm install socket.io

Using with Node http server

Server (app.js)

var app = require('http').createServer(handler)
var io = require('socket.io')(app);
var fs = require('fs');

app.listen(80);

function handler (req, res) {
  fs.readFile(__dirname + '/index.html',
  function (err, data) {
    if (err) {
      res.writeHead(500);
      return res.end('Error loading index.html');
    }

    res.writeHead(200);
    res.end(data);
  });
}

io.on('connection', function (socket) {
  socket.emit('news', { hello: 'world' });
  socket.on('my other event', function (data) {
    console.log(data);
  });
});
  

Client (index.html)

开始练习

实例1 https://segmentfault.com/a/1190000004925844

  
    
    
  
  
    

    

      Send
    
    
    
    
  

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var port = process.env.PORT || 3000;

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

io.on('connection', function(socket){
  socket.on('chat message', function(msg){
    io.emit('chat message', msg);
  });
});

http.listen(port, function(){
  console.log('listening on *:' + port);
});

Getting this example

You can find it on GitHub here.

$ git clone https://github.com/socketio/chat-example.git 

常见问题

socket.broadcast calling itself also #3165

原理分析

socket.io 原理分析