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注意：请确保子组件已经正确挂载，并且通过 defineExpose 暴露了您想要在父组件中访问的属性或方法 

parent.vue

<template><child ref="childRef"></child><button @click="fun">点击父组件</button>
</template><script setup lang="ts">
import { ref } from "vue"
import child from "./child.vue"const childRef = ref(undefined as {childFun: () => void,childFunVue2: () => void
} | undefined)
const fun = () => {console.log("fun==",childRef.value)// console.log(childRef.value)// childRef.value?.childFunVue2()
}
</script>

child.vue 

<template><div><button>这里是子组件</button>
<!--		<slot name="child1"/>-->
<!--		<slot name="child2"/>--></div>
</template><script setup lang="ts">import {defineExpose} from "vue"const childFun = () => {console.log("这里是子组件的方法")
}const childFunVue2 = () => {console.log("这里是子组件的方法Vue2")
}defineExpose({childFun,childFunVue2
})</script>