父组件
在父组件中调用子组件的sayHello()函数
<template><div><button @click="getChild('wendu')">触发子组件方法wendu</button><button @click="getChild('shidu')">触发子组件方法shidu</button><el-dialog v-model="dialogVisible" title="title" width="80%" draggable style="background: #091b37 !important; padding:1px !important" :close-on-click-modal="false"><transition><keep-alive><component :is="Child" ref="childRef" :key="b"> </component></keep-alive></transition></el-dialog></div>
</template>
<script setup>
import { ref, nextTick } from 'vue'
import Child from './components/wendu.vue'const b = ref('')
const dialogVisible = ref(false)
// 定义与 ref 同名变量
const childRef = ref(null)
const getChild = (a) => {dialogVisible.value = trueb.value = anextTick(() => {if (childRef.value) {console.log(childRef.value);console.log(childRef.value.sayHello);childRef.value.sayHello(a);} else {console.log("子组件尚未渲染");}})
}
</script>
子组件
<template><div>我是子组件</div><input type="text" v-model="inputValue">
</template><script setup>
import { ref, defineExpose } from 'vue'// 第一步：定义子组件的方法
const sayHello = (value) => {console.log(value)
}
// 第二部：暴露方法
defineExpose({sayHello
})
</script>
