如何使用nodeJS的Event Emitter 工具/原料 macbook pro atom 方法/步骤 1 打开我们的编辑器。2 引入events库。3 new一个新对象。4 设置一下事件。5 现在调用这个事件名就可以触发相应的程序了。6 我们还可以在里面设置一下参数。注意事项 注意编写的顺序 ...
Event 模块 事件驱动是 node 的一大特色。大多数 Node.js 核心 API 都采用异步事件驱动架构。 常见的事件有网络请求、文件 I/O 等。 event 模块提供一个构造函数 EventEmitter,用于事件的注册与触发事件等。 constEventEmitter=require("events");classMyEmitterextendsEventEmitter{}constemitter=newMyEmitter();//on...
On the frontend-side of an application the user interactions are handled through events, click events, keyboard events, mouse moving events, etc. In Node.js (backend-side) we can build a similar system using theevents module. What is the Event Emitter?
1. 从使用event api的消费者（consumer）的角度，event（不限于Node或JS）的思想是，我不管谁给我发...
constEventEmitter=require('events');classMyEmitterextendsEventEmitter{constructor(){super()process.nextTick(()=>{this.emit('event');// 会正常触发,因为是在继承阶段结束后才执行})}}constmyEmitter=newMyEmitter();myEmitter.on('event',()=>{console.log('an event occurred!');}); ...
const EventEmitter = require('events');class MyEmitter extends EventEmitter { constructor() { super() process.nextTick(() => { this.emit('event'); // 会正常触发,因为是在继承阶段结束后才执行 }) } }const myEmitter = new MyEmitter(); ...
为了防止Node.js进程崩溃使用了domain模块(注意,虽然domain模块已经被弃用了)。 最好的方式是listener应该总是添加’error’事件。 const myEmitter = new MyEmitter(); myEmitter.on('error', (err) => { console.error('whoops! there was an error'); }); myEmitter.emit('error', new Error('whoops...
emitter.many('foo', 4, function() { console.log('hello'); }); Pass in a namespaced event as an array rather than a delimited string. emitter.many(['foo', 'bar', 'bazz'], 4, function() { console.log('hello'); }); Installing $ npm install eventemitter2 Or you can use unpkg...
For Node.js, that means it will block other requests, defeating the strength of the platform, which is scalability through async. In the browser, a synchronous operation could potentially cause lags and block user interaction. Install npm install emittery Usage import Emittery from 'emittery'; ...
Events是node.js 最重要的模块,它提供了一个对象events.EventEmitter,EventEmitter 的核心是事件发射与事件监听器。...Node.js中大部分的模块,都继承自Event模块。 EventEmitter 支持若干个事件监听器,当事件发射时,注册到这个事件的事件监听器被依次调用,事...