socket.io：断开事件，不会触发(socket.io: disconnect event is

我做了一个简单的实时的访客计数器。

你可以从这里下载该资源库 。

什么情况是，断开事件，对服务器（甚至浏览器关闭后）是从来没有发射。

server.js是：

(function () {
var app, count, express, io;

express = require('express');
io = require('socket.io');

app = module.exports = express.createServer();

app.configure(function () {
    app.set('views', __dirname + '/views');
    app.set('view engine', 'jade');
    app.use(express.bodyParser());
    app.use(express.methodOverride());
    app.use(require('stylus').middleware({
        src: __dirname + '/public'
    }));
    app.use(app.router);
    return app.use(express.static(__dirname + '/public'));
});

app.configure('development', function () {
    return app.use(express.errorHandler({
        dumpExceptions: true,
        showStack: true
    }));
});
app.configure('production', function () {
    return app.use(express.errorHandler());
});

io = require('socket.io').listen(app);

count = 0;

io.sockets.on('connection', function (socket) {
    count++;
    io.sockets.emit('count', {
        number: count
    });
});

io.sockets.on('disconnect', function () {
    console.log('DISCONNESSO!!! ');
    count--;
    io.sockets.emit('count', {
        number: count
    });
});


app.get('/', function (req, res) {
    return res.render('index', {
        title: 'node.js express socket.io counter'
    });
});
if (!module.parent) {
    app.listen(10927);
    console.log("Express server listening on port %d", app.address().port);
}

}).call(this);

在客户端脚本是：

    script(type='text/javascript')

        var socket = io.connect();

        socket.on('count', function (data) {
            $('#count').html( data.number );
        });

Answer 1:

把你的上断开代码的内部连接块和编辑它有点像这样：

io.sockets.on('connection', function (socket) {
    count++;
    io.sockets.emit('count', {
        number: count
    });

    socket.on('disconnect', function () {
        console.log('DISCONNESSO!!! ');
        count--;
        io.sockets.emit('count', {
            number: count
        });
    });
});

这样，你当检测特定的插座（特别是你传递给在连接时运行您的匿名功能的插座）断开。

Answer 2:

从Socket.IO 1.0 io.engine.clientsCount属性可用。 这个属性告诉你很多打开的连接如何做你的应用程序目前拥有。

io.sockets.on('connection', function (socket) {
    io.sockets.emit('count', {
        number: io.engine.clientsCount
    });

    socket.once('disconnect', function () {
        io.sockets.emit('count', {
            number: io.engine.clientsCount
        });
    });
});

注：使用.once代替.on与听者会自动予以除名socket什么，现在对我们来说是很好的，因为断开连接时，只有每个插槽触发一次。

Answer 3:

万一别人做这种愚蠢的错误：确保所有插座中间件你定义调用next()结尾，否则没有其他的插座处理器将运行。

// make sure to call next() at the end or...
io.use(function (socket, next) {
    console.log(socket.id, "connection middleware");
    next(); // don't forget this!
});

// ...none of the following will run:

io.use(function (socket, next) {
    console.log(socket.id, "second middleware");
    next(); // don't forget this either!
});

io.on("connection", function (socket) {
    console.log(socket.id, "connection event");
    socket.once("disconnect", function () {
        console.log(socket.id, "disconnected");
    });
});

文章来源: socket.io: disconnect event isn't fired