我正在基于socket.io的教程在node.js中创建一个聊天应用程序。目的是让用户输入用户名和消息。聊天将显示“用户名:消息”。用户名文本字段将在第一次输入后消失。除了显示带有用户名的消息的聊天以外,我都正常工作。聊天显示四个消息而不是一个,他们说这两个变量都未定义。

JS

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

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

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

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

http.listen(3000, function(){
  console.log('listening on *:3000');
});


HTML(无样式标签)

<!doctype html>


<html>


  <head>

    <title>Lucas Chat</title>



  </head>



  <body>

    <ul id="messages"></ul>
    <form action="">
      <input id="u" autocomplete="off" placeholder="Nickname"/><input id="m" autocomplete="off" placeholder="Message"/><button>Send</button>
    </form>



      <script src="https://cdn.socket.io/socket.io-1.2.0.js"></script>
    <script src="http://code.jquery.com/jquery-1.11.1.js"></script>
    <script>
      var socket = io();
      $('form').submit(function(){
        socket.emit('chat message', $('#m').val());
        socket.emit('chat message', $('#u').val());
        $('#u').css("display", "none")
        $('#m').css("width", "90%")
        $('#m').val('');
        return false;
      });
      socket.on('chat message', function(msg, usn){
        $('#messages').append($('<li>').text(usn + ": " + msg));
      });
    </script>



  </body>
</html>

最佳答案

客户端

var socket = io();
  $('form').submit(function(){
    socket.emit('send message', {msg:$('#m').val(),user:$('#u').val()});
    $('#u').css("display", "none")
    $('#m').css("width", "90%")
    $('#m').val('');
    return false;
  });
  socket.on('receive message', function(msg){
    $('#messages').append($('<li>').text(msg));
  });


和服务器端

io.on('connection', function(socket){
  socket.on('send message', function(data){
    io.emit('receive message',data.msg + ':' + data.user);
  });
});

09-10 11:38
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