computedWithControl

显式定义计算的依赖。

¥Explicitly define the dependencies of computed.

用法

¥Usage

TypeScript

import { computedWithControl } from '@vueuse/core'

const source = ref('foo')
const counter = ref(0)

const computedRef = computedWithControl(
  () => source.value, // watch source, same as `watch`
  () => counter.value, // computed getter, same as `computed`
)

import { computedWithControl } from '@vueuse/core'
const source = ref('foo')
const counter = ref(0)
const computedRef = computedWithControl(
  () => source.value, // watch source, same as `watch`
  () => counter.value,
)

这样，counter 的更改不会触发 computedRef 更新，但 source 引用会触发。

¥With this, the changes of counter won't trigger computedRef to update but the source ref does.

console.log(computedRef.value) // 0

counter.value += 1

console.log(computedRef.value) // 0

source.value = 'bar'

console.log(computedRef.value) // 1

手动触发

¥Manual Triggering

你还可以通过以下方式手动触发计算的更新：

¥You can also manually trigger the update of the computed by:

const computedRef = computedWithControl(
  () => source.value,
  () => counter.value,
)

computedRef.trigger()

深度监控

¥Deep Watch

与 computed 不同，computedWithControl 默认是浅层执行的。你可以指定与 watch 相同的选项来控制行为：

¥Unlike computed, computedWithControl is shallow by default. You can specify the same options as watch to control the behavior:

const source = ref({ name: 'foo' })

const computedRef = computedWithControl(
  source,
  () => counter.value,
  { deep: true },
)