Socket.IO初探

創建Server

//server.js
var io = require('socket.io')(80);
var chat = io
  .of('/chat') //設定命名空間
  .on('connection', function (socket) {
    socket.emit('a message', {   //這個只會發送給本身的socket
        that: 'only'
      , '/chat': 'will get'
    });
    chat.emit('a message', {     //全局發送
        everyone: 'in'
      , '/chat': 'will get'
    });
  });

var news = io
  .of('/news')
  .on('connection', function (socket) {
    socket.emit('item', { news: 'item' });
  });

<script>
  var chat = io.connect('http://localhost/chat')  //這裏的/chat /news 就是命名空間，跟URL不要緊喔
    , news = io.connect('http://localhost/news'); //也能夠直接io()，這樣會根據你當前的URL來鏈接
  
  chat.on('connect', function () {
    chat.emit('hi!');
  });
  
  news.on('news', function () {
    news.emit('woot');
  });
</script>

發送回執

//server.js
var io = require('socket.io')(80);

io.on('connection', function (socket) {
  socket.on('ferret', function (name, fn) {
    fn('woot');
  });
});

client.js

<script>
  var socket = io(); // TIP: io() with no args does auto-discovery
  socket.on('connect', function () { // TIP: you can avoid listening on `connect` and listen on events directly too!
    socket.emit('ferret', 'tobi', function (data) {   //emit函數第三個可選參數是一個回調函數，其能夠有參數，參數的調用由服務器決定
      console.log(data); // data will be 'woot'
    });
  });
</script>

 設定發送對象

socket.emit() //發送本身
socket.broadcase.emit()  //發送到出本身之外的用戶
io.emit()  //發送所有用戶
io.of()    //設置命名空間
io.to()   // 房間的用戶