ref定义响应式数据

<template>
  <div class="person">
    <h2>{{ age }}</h2>
    <button @click="ChangeAge">修改</button>
  </div>
</template>

<script setup lang="ts" name="person222">
import {ref} from 'vue'
let age = ref(18)
console.log(age.value)
//方法
function ChangeAge() {
  age.value += 1
}

</script>

<style scoped></style>