<template>
  <h4>当前求和为：{
   
   { sum }}</h4>
  <button @click="sum++">点我++</button>
  <hr>

  <h2>姓名：{
   
   { name }}</h2>
  <h2>年龄：{
   
   { age }}</h2>
  <h2>薪资：{
   
   { job.j1.salary }}K</h2>
  <button @click="name+='~'">修改姓名</button>
  <button @click="age++">增长年龄</button>
  <button @click="job.j1.salary++">涨薪</button>
</template>

<script>
import {
     
     ref, reactive, toRefs, shallowReadonly, readonly} from 'vue'

export default {
     
     
  name: 'App',
  setup() {
     
     
    let sum = ref(0)
    let person = reactive({
     
     
      name: '张三',
      age: 18,
      job: {
     
     
        j1: {
     
     
          salary: 20
        }
      }
    })

    // person = readonly(person)
    person = shallowReadonly(person)
    sum = readonly(sum)
    // sum = shallowReadonly(sum)

    return {
     
     
      sum,
      ...toRefs(person)
    }
  }
}
</script>