VUE3-watchEffect函数（10）

<template>
  <h2>当前求和为：{
   
   { sum }}</h2>
  <button @click="sum++">点我+1</button>
  <hr>

  <h2>当前的信息为：{
   
   { msg }}</h2>
  <button @click="msg+='！'">修改信息</button>
  <hr>

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

<script>
import {
     
     ref, reactive, watchEffect} from 'vue'

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

    // watchEffect监视默认开启 immediate: true
    watchEffect(() => {
     
     
      const x1 = sum.value
      const x2 = person.job.j1.salary
      console.log(x1, x2)
      console.log('watchEffect所指定的回调执行了')
    })

    return {
     
     
      sum,
      msg,
      person
    }
  }
}
</script>