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我是新的Node.js和Socket.IO,我似乎无法弄清楚为什么我总是收到“undefined”,我' m试图在它所做的消息前面得到一个用户名,但我似乎无法摆脱那个讨厌的undefined。我如何摆脱这个Node.js聊天中的“undefined”
这是我index.js
:
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
app.get('/', function(req, res){
res.sendfile('index.html');
});
io.on('connection', function(socket){
console.log('a user connected');
io.emit('chat message','User Connected');
socket.on('disconnect', function(){
io.emit('chat message','User Disconnected');
console.log('user disconnected');
});
});
http.listen(13280, function(){
console.log('listening on *:13280');
});
io.on('connection', function(socket){
socket.on('chat message', function(msg){
console.log('message: ' + msg);
});
});
io.on('connection', function(socket){
socket.on('chat message', function(msg,username){
io.emit('chat message',username + msg);
});
});
,在这里我index.html
<!doctype html>
<html>
<head>
<title>Socket.IO chat</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font: 13px Helvetica, Arial; }
form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }
.name {margin-bottom: 40px;}
#messages { list-style-type: none; margin: 0; padding: 0; }
#messages li { padding: 5px 10px; }
#messages li:nth-child(odd) { background: #eee; }
</style>
</head>
<body>
<ul id="messages"></ul>
<form action="">
<input id="m" autocomplete="off" /><button>Send</button>
</form>
<script src="/socket.io/socket.io.js"></script>
<script src="http://code.jquery.com/jquery-1.11.1.js"></script>
<script>
var name = prompt("Choose a username","username");
var halveusername = "[" + name;
var username = halveusername + "] ";
var socket = io();
$('form').submit(function(){
socket.emit('chat message',username + $('#m').val());
$('#m').val('');
return false;
});
socket.on('chat message', function(msg){
$('#messages').append($('<li>').text(msg));
});
</script>
</body>
</html>
你发送'socket.emit(”聊天消息',用户名+ $('#m')。val());'然而你是前例pecing'socket.on('chat message',function(msg,username){'在服务器上?为什么连接的字符串会作为服务器上的两个参数返回? – adeneo