确认socket.io自定义事件

Emmit方法的第三个参数接受一个回调，该回调将传递给服务器，以便您可以调用所需的任何数据进行确认。实际上，这确实非常方便，并且节省了配对呼叫响应事件的工作量。

我正在使用刚刚测试的一些代码更新答案。

首先在 服务器端：

   io.sockets.on('connection', function (sock) {    console.log('Connected client');    sock.emit('connected', {        connected: 'Yay!'    });    // the client passes 'callback' as a function. When we invoke the callback on the server    // the pre on the client side will run    sock.on('testmessage', function (data, callback) {        console.log('Socket (server-side): received message:', data);        var responseData = { string1: 'I like ', string2: 'bananas ', string3: ' dude!'        };        //console.log('connection data:', evData);        callback(responseData);    });});

在 客户端：

console.log('starting connection...');var socket = io.connect('http://localhost:3000');socket.on('error', function (evData) {    console.error('Connection Error:', evData);});// 'connected' is our custom message that let's us know the user is connectedsocket.on('connected', function (data) {    console.log('Socket connected (client side):', data);    // Now that we are connected let's send our test call with callback    socket.emit('testmessage', {        payload: 'let us see if this worketh'    }, function (responseData) {        console.log('Callback called with data:', responseData);    });});