Socket.io没有响应，Node.js
我将我的代码移到服务器上。 此代码在我自己的服务器上完美工作并呈现数据库信息，这些服务器是在本地主机上设置的，但是从我的服务器运行代码时，会显示index.html中声明“io未定义”的错误。 无论出于何种原因，socket.io都无法识别。 此外，如果我在浏览器中输入localhost：3000，则不会显示任何内容。 任何帮助将不胜感激。
我有两个文件，server.js和index.html。
server.js：
var mysql = require('mysql')
var io = require('socket.io').listen(3000)
var db = mysql.createConnection({
host: '127.0.0.1', // Important to connect to localhost after connecting via ssh in screen
user: 'username',
password: '12345',
database: '12345',
port: 3306
})
// Log any errors connected to the db
db.connect(function(err){
if (err) console.log(err)
})
// Define/initialize our global vars
var notes = []
var isInitNotes = false
var socketCount = 0
//Socket.io code below
io.sockets.on('connection', function(socket){
// Socket has connected, increase socket count
socketCount++
// Let all sockets know how many are connected
io.sockets.emit('users connected', socketCount)
socket.on('disconnect', function() {
// Decrease the socket count on a disconnect, emit
socketCount--
io.sockets.emit('users connected', socketCount)
})
socket.on('new note', function(data){
// New note added, push to all sockets and insert into db
notes.push(data)
io.sockets.emit('new note', data)
// Use node's db injection format to filter incoming data
db.query('INSERT INTO notes (note) VALUES (?)', data.note)
})
console.log("10");
// Check to see if initial query/notes are set
if (! isInitNotes) {
// Initial app start, run db query
db.query('SELECT * FROM `Users`')
.on('result', function(data){
// Push results onto the notes array
//console.log(notes);
notes.push(data)
})
.on('end', function(){
// Only emit notes after query has been completed
socket.emit('initial notes', notes)
})
isInitNotes = true
} else {
// Initial notes already exist, send out
socket.emit('initial notes', notes)
}
})
index.html :(思考问题的方式或者是链接我的socket.io.js文件，或者是我声明变量“socket”的代码行）
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<!-- Script below works with my server I set up on local host
<script src="http://localhost:3000/socket.io/socket.io.js"></script>-->
<!-- script below properly links to the socket.io.js file in my directory, and throws no errors-->
<script type= "node_modules/socket.io/node_modules/socket.io-client/socket.io.js"></script>
<script>
$(document).ready(function(){
var socket = io.connect('http://localhost:3000'); //LINE OF CODE IN QUESTION
//Code below not really relevant to problem, but still part of my project.
socket.on('initial notes', function(data){
var html = ''
for (var i = 0; i < data.length; i++){
// We store html as a var then add to DOM after for efficiency
html += '<li>' + data[i].Name + '</li>'
}
$('#notes').html(html)
})
// New note emitted, add it to our list of current notes
socket.on('new note', function(data){
$('#notes').append('<li>' + data.Name + '</li>')
})
// New socket connected, display new count on page
socket.on('users connected', function(data){
$('#usersConnected').html('Users connected: ' + data)
})
// Add a new (random) note, emit to server to let others know
$('#newNote').click(function(){
var newNote = 'This is a random ' + (Math.floor(Math.random() * 100) + 1) + ' note'
socket.emit('new note', {note: newNote})
})
})
</script>
<ul id="notes"></ul>
<div id="usersConnected"></div>
<div id="newNote">Create a new note:</div
解决了！
弄清楚了。 我用“脚本src =”我的服务器IP地址：3000 / socket.io / socket.io.js“，然后将变量套接字更改为var socket = io.connect（'Servers ip address：3000'）;所以答案要一起取出本地主机。
我相信如果它在本地工作（可能是权限问题？），从服务器加载Socket.io可能会出现问题，请尝试从Socket.io CDN加载它进行测试。
<script src="http://cdnjs.cloudflare.com/ajax/libs/socket.io/0.9.16/socket.io.min.js"></script>