Package Exports

message-center.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (message-center.js) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

MessageCenter 一个简易的消息中心

Install and test

# install
npm install message-center.js

Example

const messageCenter = new MessageCenter()

messageCenter.on("aaa|bbb|ccc", (a,b,c) => {
  //...
})

messageCenter.emit('aaa', 0, 1, 2)

messageCenter.un('aaa')

API

on(eventName, handler, context?, weight?)

为指定事件注册一个监听器，接受一个字符串 eventName 和一个回调函数。

messageCenter.on('aaa|bbb|ccc', () => {
  //do something
});

// 等价于
     messageCenter.on('aaa', () => {
       //do something
     });
     
     messageCenter.on('bbb', () => {
       //do something
     });
     
     messageCenter.on('ccc', () => {
       //do something
     });

once(eventName, handler, context?, weight?)

为指定事件注册一个单次监听器,监听器最多只会触发一次,触发后立刻解除该监听器。

emit(eventName, ...args)

按参数的顺序执行每个监听器

un(eventName, handler?)

解除监听器如没有传入handler,将会解除eventName名下所有监听器

clear()

重置 messageCenter

listenersLength(eventName)

计算监听器的数量

watch(eventName, handler, ...args)

与invoke方法一起使用, 能够返回watch方法的handler可以收到invoke方法的计算结果同时invoke也能够收到watch方法的返回结果

invoke(eventName, ...args)

    const messageCenter = new MessageCenter()
    
    messageCenter.watch("aaa", (a,b,c) => {
      // a === 0
      // b === 1
      // c === 2
      return { a: 2, b: 3, c: 4}
    })
    
    messageCenter.invoke('aaa', 0, 1, 2).then(data => {
      // data === { a: 2, b: 3, c: 4}
    })