4 - 可写的计算属性

[mengsi16]

<script setup lang="ts">
import { ref, computed } from "vue"

const count = ref(1)
const plusOne = computed({
  get:()=>count.value+1,
  set:(val)=>(count.value=val-1)
})

/**
 * Make the `plusOne` writable.
 * So that we can get the result `plusOne` to be 3, and `count` to be 2.
*/

plusOne.value++

</script>

<template>
  <div>
    <p>{{ count }}</p>
    <p>{{ plusOne }}</p>
  </div>
</template>