8 - Effect作用域 API

[TheHighlandss]

<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>