computedWithControl

类别

Reactivity

导出大小

251 B

最近修改

2 days ago

别名

controlledComputed

相关

refWithControl

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,
)

这样的话，counter 的变化不会触发 computedRef 更新，但会触发 source 引用更新。

🌐 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 默认是浅层的。 你可以指定与 watch 相同的选项来控制其行为：

🌐 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 },
)