一、父给子发信息

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父组件发送信息给子组件
index.vue

import Back from '@/components/common/back.vue'
const title = ref('你好呀')

// template部分
<Back :title="title" />

子组件接收父组件信息
/components/common/back.vue

<script setup>
import { toRefs } from 'vue'
const props = defineProps({
	title: {
		type: String,
		default: '标题',
		required: true,
	},
})
const { title } = toRefs(props)
</script>
<template>
	<span>{{ title }}</span>
</template>

二、子给父发信息

子组件发信息给父组件
/components/relax/relax-index.vue

const emit = defineEmits(['goTreeHode'])
const goHold = () => {
  emit('goTreeHode', true)
}

//template
<button  @click="goHold">传值</button>

父组件接收子组件信息
relax.vue

import RelaxIndex from '@/components/relax/relax-index.vue'

//template
 <RelaxIndex @goTreeHode="goTreeHode" />