效果：

父far.vue

<template>
  <div>
    <div>
      父组件内容
      <pre>value1:{{ value1 }}</pre>
      <el-button type="primary">flag1:{{ flag1 }}</el-button>
      <pre>obj1:{{ obj1 }}</pre>
      <el-input v-model="obj1.name" placeholder=""></el-input>
    </div>

    <el-button type="primary" @click="getSonData">父组件触发子组件事件</el-button>


    <!-- :value1="value1" 是正常传值 -->
    <!-- v-model="flag1"  是匿名双向绑定 -->
    <!-- v-model:obj2="obj1" 是具名obj2双向绑定 -->
    <son ref="sonRef" :value1="value1" v-model="flag1" v-model:obj2="obj1"></son>


  </div>
</template>

<script setup>
import { ref } from "vue"
import son from './components/son.vue'
let value1 = ref('123')
let flag1 = ref(false)
let obj1 = ref({
  name: 'jack',
  age: 18
})


const sonRef = ref(null)
// 父组件触发子组件事件
const getSonData = () => {
  if (!sonRef.value) return
  sonRef.value.sonFun()
}
</script>

<style lang="scss" scoped></style>

子组件：son.vue

<template>
  <div style="margin-top: 100px;">
    子组件：{{ value1 }} {{ modelValue }} {{ obj2 }}
    <br>
    正常使用：<el-input v-model="value2" placeholder=""></el-input>
    <br>

    <el-button type="primary" @click="changeFlag">双向修改flag1：{{ localValue }}</el-button>

    <br>
    双向修改：<el-input v-model="obj3.name" placeholder="" @change="changeName"></el-input>
  </div>

</template>

<script script setup>
import { ref, defineOptions, defineProps, defineEmits, watch } from 'vue'

const emit = defineEmits(['value1', 'update:modelValue', 'update:obj2']);

defineOptions({
  name: " Son"
})
const props = defineProps({
  value1: {
    type: [String, Number],
    default: () => {
      return undefined
    }
  },
  modelValue: { // 父组件 v-model 时数据没有指定参数名，所以此时属性modelValue会接收到v-model变量 即 flag1
    type: Boolean,
    default: () => {
      return false
    }
  },
  obj2: { // 具名双向绑定
    type: Object,
    default: () => {
      return {}
    }
  },
})
let value2 = ref(props.value1)
let localValue = ref(props.modelValue || false)
let obj3 = ref(props.obj2 || {})
const changeFlag = () => {
  localValue.value = !localValue.value
  emit('update:modelValue', localValue.value) // 同步修改父组件的值
}
const changeName = () => {
  emit('update:obj2', obj3.value) // 同步修改父组件的值
}

// 监听属性变化
watch([() => props.modelValue, () => props.obj2], ([modelValue, obj2]) => {
  console.log(modelValue, obj2);
}, { deep: true, immediate: true })



// 子组件暴露给父组件的方法
const sonFun = () => {
  console.log('子组件暴露给父组件的方法', 1);
}
// 暴露
defineExpose({
  sonFun
})
</script>

<style lang="scss" scoped></style>