8 - Effect作用域 API

[MaftyNavue-Erin]

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

const counter = ref(1)
const doubled = computed(() => counter.value * 2)

// use the `effectScope` API to make these effects stop together after being triggered once
const scope = effectScope()

scope.run(() => {
  watch(doubled, () => {
  console.log(doubled.value);
  scope.stop()
  })

  watchEffect(() => {
    console.log(`Count: ${doubled.value}`);
    scope.stop()
    })
  })

counter.value = 2

setTimeout(() => {
  counter.value = 4
})

</script>

<template>
  <div>
    <p>
      {{ doubled }}
    </p>
  </div>
</template>