Node.js监听器定义

Question

你会如何确定node.js中的监听器？

它们是事件发射器对象，它侦听某些事件发生，然后通知事件发射器或调用回调函数？

任何帮助理解

Answer 1

使用Event Emitter

下面是一个简单的例子：

const EventEmitter = require('events'); 

class MyEmitter extends EventEmitter {} 

const myEmitter = new MyEmitter(); 

myEmitter.on('someCoolEvent',() => { // Here is where we are listening for event to occur 
    console.log('an event occurred!'); 
}); 


myEmitter.emit('someCoolEvent'); // here is how we emit the event