emitter

简介

Event emitter,本软件是移植开源软件 emitter 源码在OpenHarmony上进行功能适配，在OpenHarmony上已支持原库的功能。 移植参考教程文档第三方开源js库移植适配指南.

It's simpler and more lightweight, and it works in any JavaScript environment, not just Node.js. It also provides mixin functionality to add event handling to existing objects without needing inheritance.

下载安装

ohpm  install @yyz116/emitter 

OpenHarmony ohpm 环境配置等更多内容，请参考如何安装 OpenHarmony ohpm 包

使用说明

1. 引入依赖

import {Emitter}  from "@yyz116/emitter"

2. 使用举例

import {Emitter}  from "@yyz116/emitter"

var emitter = new Emitter;
emitter.on('someEvent', function(arg1, arg2){
  console.log('listener1', arg1, arg2);
})
emitter.emit('someEvent', 'csdn.net/qq8864', 1991);

3. 注意事项 在ets中使用的是es6的模块使用规范，使用import而不是require。

以下是原库的介绍内容，注意在harmonyos中原库的部分用法有区别，比如require的模块化用法不能用在鸿蒙中。

@socket.io/component-emitter

Event emitter component.

Installation

$ npm i @socket.io/component-emitter

API

Emitter(obj)

The Emitter may also be used as a mixin. For example a "plain" object may become an emitter, or you may extend an existing prototype.

As an Emitter instance:

import { Emitter } from '@socket.io/component-emitter';

var emitter = new Emitter;
emitter.emit('something');

As a mixin:

import { Emitter } from '@socket.io/component-emitter';

var user = { name: 'tobi' };
Emitter(user);

user.emit('im a user');

As a prototype mixin:

import { Emitter } from '@socket.io/component-emitter';

Emitter(User.prototype);

Emitter#on(event, fn)

Register an event handler fn.

Emitter#once(event, fn)

Register a single-shot event handler fn, removed immediately after it is invoked the first time.

Emitter#off(event, fn)

• Pass event and fn to remove a listener.
• Pass event to remove all listeners on that event.
• Pass nothing to remove all listeners on all events.

Emitter#emit(event, ...)

Emit an event with variable option args.

Emitter#listeners(event)

Return an array of callbacks, or an empty array.

Emitter#hasListeners(event)

Check if this emitter has event handlers.

License

MIT