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>
以上就是Vue3兄弟组件传值之mitt怎么安装使用的详细内容。
