Vue3 uses mitt for component communication

Liang said to himself 2021-05-03 19:19:42
vue3 vue uses mitt component

  • Vue2.x Use EventBus Component communication , and Vue3.x Recommended mitt.js.
  • Compared with Vue Example of EventBus,mitt.js What's good about it ? First, it's small enough , have only 200bytes, Secondly, it supports monitoring and batch removal of all events , It doesn't depend on Vue example , So it can be used across frameworks ,React perhaps Vue, even to the extent that jQuery All projects can use the same set of Libraries .

1. install

  • Recommended yarn install ( I know how smooth it is after using it )
yarn add mitt
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  • Or by npm install
npm install --save mitt
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2. Introduce into the project and mount

  • Can be in main.js Mount to global
// The standard ES Modular Introduction 
import mitt from 'mitt'
const app = createApp(App)
// vue3.x Global instance of , To be mounted on config.globalProperties On 
app.config.globalProperties.$EventBus = new mitt()
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  • /common/EventBus.js: You can also encapsulate a ES modular , Expose one Mitt example
import mitt from 'mitt'
export default new mitt()
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  • /views/Home.vue: Business modules are introduced to use
import EventBus from '/common/EventBus.js'
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3. Use

  • adopt on monitor /emit Trigger
* App.vue
// setup There is no this, Need to pass through getCurrentInstance To get Vue example 
import { getCurrentInstance } from 'vue'
import { Mp3Player } from '/common/Mp3Player.js'
export default {
// ctx Equate to Vue2.x Of this
const { ctx } = getCurrentInstance()
// monitor - If there is a new task, play the sound effect 
ctx.$EventBus.on('newTask', data => {
// It can also be done through * Monitor all tasks 
ctx.$EventBus.on('*', data => {
console.log('EventBus come in', data)
* Control.vue
// When judging a new task , Trigger 
ctx.$EventBus.emit('newTask', data)
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  • off Remove events
import {
} from 'vue'
export default {
const { ctx } = getCurrentInstance()
onBeforeUnmount(() => {
// Remove the specified event 
// Remove all events 
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Reference resources

本文为[Liang said to himself]所创,转载请带上原文链接,感谢

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