确认socket.io自定义事件

Question

我正在寻找一种方法来确认socket.emit调用.

socket.emit('message', msg);

我已经看到一种机制,接收器将发送另一个自定义事件作为确认,但这将在我的聊天应用程序中添加数千个传输.请建议一个有效的方法.

Answer 1

emit方法的第三个参数接受一个将被传递给服务器的回调,以便您可以使用您希望的任何数据进行确认.它实际上非常方便,节省了配对呼叫响应事件的工作量.

我正在使用我刚测试的一些代码更新我的答案.

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 code 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 connected
socket.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);
    });
});