第一种方式：普通写法

父组件：Father.vue

<template>
	<h1>父组件</h1>
	<el-button @click="showDialog">点击展示弹框</el-button>
	<Dialog v-model:dialogVisible="dialogVisible" />
</template>
<script>
import { Dialog } from '@components/Dialog.vue'

export default {
	setup() {
		const dialogVisible = ref(false);
		function showDialog(){
			dialogVisible.value = true
		};
		return {
			dialogVisible,
			showDialog
		}
	},
}
</script>

子组件：Child.vue

<template>
    <el-dialog v-model="dialogVisible" title="我是一个弹框">
        <p>我是弹框的内容</p>
        <el-button @click="confirm">关闭弹框</el-button>
    </el-dialog>
</template>
<script>
export default {
    props: {
        dialogVisible: {
            type: Boolean,
            required: true,
        },
    },
    setup(props, { emit }) {
        function confirm() {
            emit("update:dialogVisible", false);
        }
        return {
            confirm,
        };
    },
};
</script>

第二种写法：组合式API

父组件：Father.vue

<template>
    <h1>父组件</h1>
    <el-button @click="showDialog">点击展示弹框</el-button>
    <Dialog v-model:dialogVisible="dialogVisible" />
</template>
<script setup>
import { Dialog } from "@components/Dialog.vue";

const dialogVisible = ref(false);
const showDialog = () => {
    dialogVisible.value = true;
};
</script>

子组件：Child.vue

<template>
    <el-dialog v-model="dialogVisible" title="我是一个弹框">
        <p>我是弹框的内容</p>
        <el-button @click="confirm">关闭弹框</el-button>
    </el-dialog>
</template>
<script setup>
const props = defineProps({
	dialogVisible:{
		type:Boolean,
		required:true
	}
});
const emit = defineEmits(["update:dialogVisible"]);
const confirm = ()=>{
	emit('update:dialogVisible',false)
};
</script>