VUE3----

readonly 与 shallowReadonly

• readonly:让一个响应式数据变为只读(深只读)

• shallowReadonly:让一个响应式数据变为只读(浅只读)

• 应用场景:不希望数据被修改时

<template>
  <h4>当前的求和为:{{sum}}</h4>
  <button @click="sum++">点我++</button>
  <hr>
  <h2>姓名:{{name}}</h2>
  <h2>年龄:{{age}}</h2>
  <h2>薪水:{{job.j1.salary}}</h2>
  <button @click="name+='~'">修改姓名</button>
  <button @click="age++">增长年龄</button>
  <button @click="job.j1.salary++">增长薪水</button>
</template>

<script>
import {reactive, ref,toRefs,readonly,shallowReadonly} from 'vue'
export default {
  name:'demo',
  setup(){
    // 数据
    let person = reactive({
      name:'张三',
      age:18,
      job:{
        j1:{
          salary:20
        }
      }
    })

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

    let sum = ref(0)

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

    // 返回一个对象(常用)
    return {
      sum,
      ...toRefs(person)
    }
  },
}
</script>