8 - Effect作用域 API

[zgsgs]

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

counter.value = 2;
setTimeout(() => {
  scope.stop();
  counter.value = 4;
});
</script>

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