Socket.IO初探

Posted 2020-06-08

建立Server

//server.js
var io = require(‘socket.io‘)(80);
var chat = io
  .of(‘/chat‘) //设定命名空间
  .on(‘connection‘, function (socket) {
    socket.emit(‘a message‘, {   //这个只会发送给自己的socket
        that: ‘only‘
      , ‘/chat‘: ‘will get‘
    });
    chat.emit(‘a message‘, {     //全局发送
        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‘)  //这里的/chat /news 就是命名空间，跟URL没关系喔
    , news = io.connect(‘http://localhost/news‘); //也可以直接io()，这样会根据你当前的URL来连接
  
  chat.on(‘connect‘, function () {
    chat.emit(‘hi!‘);
  });
  
  news.on(‘news‘, function () {
    news.emit(‘woot‘);
  });
</script>

发送回执

//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函数第三个可选参数是一个回调函数，其可以有参数，参数的调用由服务器决定
      console.log(data); // data will be ‘woot‘
    });
  });
</script>

 设定发送对象

socket.emit() //发送自己
socket.broadcase.emit()  //发送到出自己以外的用户
io.emit()  //发送全部用户
io.of() / io.to()  //发送命名空间 / 房间的用户