4 - 可写的计算属性

[kid1110]

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

const count = ref(1)
const plusOne = computed({
  get(){
    return 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>