useCached

类别

Utilities

导出大小

195 B

最近修改

4 weeks ago

使用自定义比较器缓存引用。

🌐 Cache a ref with a custom comparator.

比较器的签名是 (newSourceValue, cachedValue) => boolean。 当它返回 true 时，缓存保持不变。当它返回 false 时，缓存会更新为新的源值。

🌐 The comparator signature is (newSourceValue, cachedValue) => boolean. When it returns true, the cache is kept as-is. When it returns false, the cache is updated to the new source value.

示例

源代码在线运行

Value: 42

Extra: 0

Cached Value: 42

Cached Extra: 0

Temp Value:

Local Extra:

用法

🌐 Usage

TypeScript

import { useCached } from '@vueuse/core'
import { shallowRef } from 'vue'

interface Data {
  value: number
  extra: number
}

const source = shallowRef<Data>({ value: 42, extra: 0 })
const cached = useCached(source, (newSourceValue, cachedValue) => newSourceValue.value === cachedValue.value)

source.value = {
  value: 42,
  extra: 1,
}

console.log(cached.value) // { value: 42, extra: 0 }

source.value = {
  value: 43,
  extra: 1,
}

console.log(cached.value) // { value: 43, extra: 1 }

import { useCached } from '@vueuse/core'
import { shallowRef } from 'vue'
const source = shallowRef({ value: 42, extra: 0 })
const cached = useCached(
  source,
  (newSourceValue, cachedValue) => newSourceValue.value === cachedValue.value,
)
source.value = {
  value: 42,
  extra: 1,
}
console.log(cached.value) // { value: 42, extra: 0 }
source.value = {
  value: 43,
  extra: 1,
}
console.log(cached.value) // { value: 43, extra: 1 }