Node EventEmitter

Node EventEmitter

观察者模式的体现

来自 Sapphire611 (opens new window)

---

Demo

// xxxService.js
const EventEmitter = require('events');

class MyService extends EventEmitter {
  // ...
}

const myEmitter = new MyService();
myEmitter.on('event', callback);
module.exports = myEmitter;

// 别的地方引用,先require
myEmitter.emit('event'); // emit event

---

支持传参Demo

// xxxService.js
const EventEmitter = require('events');

class MyService extends EventEmitter {
  emit(event, ...query) { 
		return super.emit(event, query);
	}
}

const myEmitter = new MyService();
myEmitter.on('event', callback);
module.exports = myEmitter;


myEmitter.emit('event',[1,2,3,4,5]); // emit event