vue中ref和$refs获取元素dom、获取子组件数据与方法调用示例

<div ref="demo">测试测试</div>

const demoDom =  this.$refs.demo;

<Son ref="sonRef"></Son>

const sonDom = this.$refs.sonRef;

<template>
    <div>
        <div ref="demo">测试测试</div>
        <h1 style="color: red;" :onclick="getDemo">点击获取demo</h1>
        <h1 style="color: red;margin-top: 50px;" @click="getSonRef">点击获取子组件实例</h1>

        <Son ref="sonRef"></Son>
        <div v-if="sonData.das">
            <p>{{ sonData.das }}</p>
            <botton @click="sonData.fun">调用子组件方法</botton>
        </div>
    </div>
</template>
<script>
import Son from './son.vue'
export default {
    components: {
        Son
    },

    data() {
        return {
            sonData: {}
        }
    },

    methods: {
        getDemo() {
            const demoDom = this.$refs.demo;
            console.log('获取到的demo的Dom数据是===', demoDom);
        },
        getSonRef() {
            const sonDom = this.$refs.sonRef;
            this.sonData = sonDom;
             console.log('获取到的子组件的实例是===', sonDom);
        }
    }

}
</script>

<!-- vue3的写法 -->
<!-- <script setup>
import Son from './son.vue'
import { ref } from 'vue'

// 声明同名的ref变量即已经去获取了对应的dom或实例，相当于执行了this.$refs.xxx
let demo = ref()
let sonRef = ref()

const getDemo = () => {
    console.log('获取到的demo的Dom数据是===', demo);
}
const getSonRef = () => {
    console.log('获取到的子组件的实例是===', sonRef);
}
</script> -->

<template>
    <div>子组件</div>
</template>
<script>
export default {

    data() {
        return {
            das: '我是子组件数据呀'
        }
    },
    methods: {
        fun() {
            console.log('我是子组件方法呀');
        }
    }
}
</script>