useCached

分类

实用工具

导出大小

199 B

上次更改

8 个月前

使用自定义比较器缓存一个 ref。

演示

源代码在线演示 (beta)

值: 42

额外: 0

缓存值: 42

缓存额外: 0

临时值

本地额外

用法

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
, (a
, b
) => a
.value
 === b
.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, (a, b) => a.value === b.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 }

类型声明

export interface UseCachedOptions
<D
 extends boolean = true>
  extends ConfigurableDeepRefs<D
>,
    WatchOptions {}
export declare function useCached
<T
, D
 extends boolean = true>(
  refValue
: Ref
<T
>,
  comparator
?: (a
: T
, b
: T
) => boolean,
  options
?: UseCachedOptions
<D
>,
): UseCachedReturn
<T
, D
>
export type UseCachedReturn
<
  T
 = any,
  D
 extends boolean = true,
> = ShallowOrDeepRef
<T
, D
>