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);
});
});