Nodejs socketIO

//    





    
    
    
    
    



    

    

          
    




    
    var socket = io();//   socketIO,  socket    
    
    $(function () {
    socket.emit('chats','zzw');//    ,   socket.id         
    console.log(socket);
    $('form').submit(function(e){//form      
      e.preventDefault(); // prevents page reloading
      socket.emit('chat message', $('#m').val());//          ，             
      $('#m').val('');//        
      return false;
    });
    
    socket.on('chat message', function(msg){//         ,         
      $('#messages').append($('<li>').text(msg));
    });
  });
  

//    

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);

app.get('/', function (req, res) {//    
    res.sendFile(__dirname + '/socketDemo.html');//      
});
let socketWall;
io.on('connection', function (socket) {//  connection  
    
    socket.on('chats',function(msg){//       ，        socket.id
        socketWall = msg;
        console.log('  '+socketWall+'   ');
    });
    socket.on('chat message', function (msg) {//     ，                
        console.log(socketWall);
        io.emit('chat message', '  '+socketWall+' ：'+msg);//  emit         
    });

    socket.on('disconnect', function () {//        
        console.log('  '+socketWall+'  ');
    });
});

http.listen(8100, function () {//    
    console.log('listening on *:8100');
});