Vue3兄弟组件传值之mitt的超详细讲解

npm install --save mitt

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')

<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>

<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>

import mitt from "mitt";
const emiter = mitt();
export default emiter;

<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>

<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>