html
<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,watch} from 'vue'
export default {
name: 'Demo',
setup(){
//数据
let sum = ref(0)
let msg = ref('你好啊')
let person = ref({
name:'张三',
age:18,
job:{
j1:{
salary:20
}
}
})
console.log(person)
watch(sum,(newValue,oldValue)=>{
console.log('sum的值变化了',newValue,oldValue)
})
watch(person,(newValue,oldValue)=>{
console.log('person的值变化了',newValue,oldValue)
},{deep:true})
//返回一个对象(常用)
return {
sum,
msg,
person
}
}
}
</script>
监视person时,不加.value是监视person对象。加了.value是监视person内部通过reactive生成的对象。