本篇内容介绍了“Vue3兄弟组件传值之mitt怎么安装使用”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
比起 Vue 实例上的 EventBus,mitt.js 好在哪里呢?
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首先它足够小,仅有200bytes。
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其次支持全部事件的监听和批量移除。
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它还不依赖 Vue 实例,可以跨框架使用,React 或者 Vue,甚至 jQuery 项目都能使用同一套库。
项目中安装mitt
npm install --save mitt
使用方式一:在原型中声明
一、在 main.ts\color{#ef2d26}{main.ts}main.ts 中注册挂载到全局
import { createApp } from 'vue' import App from './App.vue' import mitt from 'mitt' import router from "./router"; const app = createApp(App) // vue3挂载到全局 app.config.globalProperties.$mitt = mitt(); app.use(router).mount('#app')
二、在home.vue组件中使用 emit\color{#ef2d26}{emit}emit 发送信息
<template> <div class="home-container"> <p>这里是home组件</p> <button @click="sendMitt">$mitt发送数据</button> <About></About> </div> </template> <script lang="ts" setup> import { getCurrentInstance, ref, ComponentInternalInstance } from 'vue'; import About from '../about/about.vue' const { appContext } = getCurrentInstance() as ComponentInternalInstance; const money = ref<number>(98); const sendMitt = () => { appContext.config.globalProperties.$mitt.emit('moneyEvent', money.value += 2); } </script> <style lang="less"> </style>
二、在about.vue组件中使用 on\color{#ef2d26}{on}on 接收信息
<template> <div class="about-container"> <p>这里是about组件</p> <p>接收到的数据:{{ amount }}</p> </div> </template> <script lang="ts" setup> import { ref, getCurrentInstance, ComponentInternalInstance, onBeforeMount, onMounted } from 'vue'; const amount = ref(0); const { appContext } = getCurrentInstance() as ComponentInternalInstance; onMounted(() => { appContext.config.globalProperties.$mitt.on('moneyEvent', (res: number) => { amount.value = res; }) }) onBeforeMount(() => { appContext.config.globalProperties.$mitt.off('moneyEvent'); }); </script> <style lang="less"> .about-container { background-color: #f0f0f0; } </style>
使用方式二:在组件中引用
一、新建 bus.ts\color{#ef2d26}{bus.ts}bus.ts 文件
import mitt from "mitt"; const emiter = mitt(); export default emiter;
二、在home.vue组件中引入并使用 emit\color{#ef2d26}{emit}emit 发送信息
<template> <div class="home-container"> <p>这里是home组件</p> <button @click="sendMitt">$mitt发送数据</button> <About></About> </div> </template> <script lang="ts" setup> import { ref } from 'vue'; import About from '../about/about.vue' import emitter from '../../utils/bus' const money = ref<number>(98); const sendMitt = () => { emitter.emit('moneyEvent', money.value += 2); } </script> <style lang="less"> </style>
二、在about.vue组件中引入并使用 on\color{#ef2d26}{on}on 接收信息
<template> <div class="about-container"> <p>这里是about组件</p> <p>接收到的数据:{{ amount }}</p> </div> </template> <script lang="ts" setup> import { ref, onBeforeMount, onMounted } from 'vue'; import emitter from '../../utils/bus' const amount = ref(0); onMounted(() => { emitter.on('moneyEvent', (res: any) => { amount.value = res; }); }) onBeforeMount(() => { emitter.off('moneyEvent'); }); </script> <style lang="less"> .about-container { background-color: #f0f0f0; } </style>