node.js - 无法通过 socket.io 发出？

Question

我最近将socket.io更新到最新版本0.9.8

上次我使用该应用程序时，我做了如下操作:

io.sockets.emit("logged",this);

并且成功了。现在我得到:

TypeError: Cannot call method 'emit' of undefined
    at new Agent (/var/www/panel/models/agent.js:29:16)
    at module.exports (/var/www/panel/modules/app.js:35:47)
    at Query.Client.query (/var/www/panel/node_modules/mysql/lib/client.js:108:11)
    at Query.EventEmitter.emit (events.js:85:17)
    at Query._handlePacket (/var/www/panel/node_modules/mysql/lib/query.js:51:14)
    at Client._handlePacket (/var/www/panel/node_modules/mysql/lib/client.js:319:14)
    at Parser.EventEmitter.emit (events.js:88:17)
    at Parser.write.emitPacket (/var/www/panel/node_modules/mysql/lib/parser.js:71:14)
    at Parser.write (/var/www/panel/node_modules/mysql/lib/parser.js:576:7)
    at Socket.EventEmitter.emit (events.js:88:17)

我认为这是因为范围或其他什么原因，所以我这样做了:

// server.js
var express = require('express'),
    server = express(),
    Routes = require('./routes'),
    App = require('./modules/app.js'),
    database = require('./libraries/mysql.js'),
    io = require('socket.io'),
    mysql = require('mysql');


server.listen(8080);
io.listen(server);
io.sockets.emit('Hi there', {});

它就是不起作用，同样的错误，不同的行。

我做错了什么？

Answer 1

您需要保存 socketio.listen 的返回值并与之交互。我建议您按照 socket.io 中的示例进行操作。像这样的事情应该可以解决问题:

var express = require('express'),
    server = express(),
    socketio = require('socket.io');

server.listen(8080);
var io = socketio.listen(server);
io.sockets.emit('Hi there', {});

或者甚至:

var express = require('express'),
    server = express(),
    io = require('socket.io').listen(server);

server.listen(8080);
io.sockets.emit('Hi there', {});