Send feedback in socket.on() in socket.io

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http://www.csser.com/board/4f5ed68d417a7f6a6e000059

发送、接收需要确认的数据

在服务端与终端发送消息的过程中，如需要对方接收到消息后立刻得到确认，则只需在 .send 或 .emit最后一个参数传入回调函数就可以了。

服务端代码

var io = require('socket.io').listen(80);io.sockets.on('connection', function (socket) {socket.on('ferret', function (name, fn) {fn('woot');});
});

客户端代码

<script>var socket = io.connect(); // TIP: .connect with no args does auto-discoverysocket.on('connect', function () { // TIP: you can avoid listening on `connect` and listen on events directly too!socket.emit('ferret', 'tobi', function (data) {console.log(data); // data will be 'woot'});});
</script>

http://stackoverflow.com/questions/6756241/socket-io-client-side-emit-callback-never-fires

var io = require('socket.io').listen(80);io.sockets.on('connection', function (socket) {socket.on("getSomeData", function(name,fn) {fn({data: "some random data"});});
});

Client

<script src="http://localhost/socket.io/socket.io.js"></script>
<script>var socket = io.connect('http://localhost');socket.emit("getSomeData", function(data) {console.log(data);});
</script>

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