在socket io中的event的回调函数中获取事件名称

Question

我正在构建一个充当套接字客户端和服务器的中间节点服务器,我希望监听后端服务器事件,然后在处理后将事件转发到客户端(浏览器).

var socket = require('socket.io'),
    client = require('socket.io-client');

socket.on('event_name', function(data) {
    /* Logic to process response and relay to client */
    client.emit(this.event, data); // How can I get name of the outer event?
});

我想获得event_name回调中的值.我能怎么做？

Answer 1

我不确定您是否可以从回调中获取事件名称,但您可以解决它.

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

function registerEvent(eventName, cb) {
  socket.on(eventName, function () {
    var args = [].slice.apply(arguments);
    args.unshift(eventName);
    cb.apply(null, args);
  });
}

registerEvent('my_event', function (eventName, data) {
  // now you can access event name
  // it is prepended to arguments
  console.log('Event name', eventName);
});

Answer 2

你可以尝试类似的东西：

// List of events relayed to client
var    events = ['first_event', 'second_event', 'third_event'];

for (var i in events)
    (function(e) {
         socket.on(e, function(data) {
            console.log(e); // You have access to the event name
            client.emit(e, data); // Relay to client
         }); 
    })(events[i]);