我试图在不同的node.js模块中共享socket.io的套接字对象,虽然我失败并获得空对象
Cannot call method 'on' of undefined
我的代码：
app.js
var express = require('express'),app = express();
var server = require('http').createServer(app),io = require('socket.io').listen(server)
var routes = require('./routes'),path = require('path'),RSS = require('./routes/RSS')
// ...
exports.io = io;
路线/ RSS.js
io = require(__dirname + '/../app');
console.log(io);
io.sockets.on('connection',function(
console.log("Connection on socket.io on socket");
// .. do stuff
});
这是我得到的输出：
$node app.js
info - socket.io started
{}
/home/XXX/programming/nodejs/node-express-aws/routes/RSS.js:10
io.sockets.on('connection',function(socket){
^
TypeError: Cannot call method 'on' of undefined
at Object.<anonymous> (/home/XXX/programming/nodejs/node-express-aws/routes/RSS.js:10:12)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object.<anonymous> (/home/XXX/programming/nodejs/node-express-aws/app.js:9:10)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
虽然我已经尝试过,但我只能在一个(app.js)文件中使用socket.io
var express = require('express'),RSS = require('./routes/RSS')
// ...
io.sockets.on('connection',function(socket){
logger.debug("Connection on socket.io on socket");
socket.emit('news',{will: 'be recived'});
});
解决方法
因为在app.js中你有：
exports.io = io;
然后你需要像这样使用它：
var app = require('../app');
var io = app.io;
也就是说,您将一个名为io的属性附加到模块,因此当您需要该模块时,您将获得一个具有io属性集的对象.
你也可以这样做
module.exports = io;
然后离开RSS.js就像现在一样.
总而言之,如果您使用Node运行app.js,您会更常见地将io对象注入到其他模块中(而不是相反);例如：
app.js
var express = require('express'),RSS = require('./routes/RSS')
// ...
RSS(io); // pass `io` into the `routes` module,// which we define later to be a function
// that accepts a Socket.IO object
路线/ RSS.js
module.exports = function(io) {
io.sockets.on('connection',function(
console.log("Connection on socket.io on socket");
// .. do stuff
});
}
