javascript - 用一个事件桥接两个事件监听器

Question

我正在尝试“桥接”两个事件侦听器，以便通过单个事件触发它们。此外，在这个“链”中，我可以将额外的值作为参数传递给后面的听众。

我试图通过如下方式实现它

var events = require('events');

var receiv = new events.EventEmitter();
var midl = new events.EventEmitter();

receiv.on("test", function() {
    console.log("HERE", arguments);
});

midl.on("test", receiv.on.bind(receiv, "test", "foo", "bar"));

midl.emit("test", 123);

然而，当我收到以下错误时，这种方法似乎会破坏 EventEmitter

TypeError: listener must be a function
    at TypeError (<anonymous>)
    at EventEmitter.addListener (events.js:130:11)
    at EventEmitter.emit (events.js:95:17)
    at Object.<anonymous> (myEventTest.js:12:6)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)

干杯。

PS我使用节点v0.10.5

Answer 1

很抱歉自我回答，但我找到了解决方案。

var events = require('events');

var receiv = new events.EventEmitter();
var midl = new events.EventEmitter();

receiv.on("test", function() {
    console.log("HERE", arguments);
});

midl.on("test", receiv.emit.bind(receiv, "test", "foo", "bar"));

midl.emit("test", 123);