usePrevious

类别

Utilities

导出体积

260 B

上次更改

2 minutes ago

保存 ref 的先前值。

用法

import { usePrevious } from '@vueuse/core'
import { ref } from 'vue'

const counter = ref('Hello')
const previous = usePrevious(counter)

console.log(previous.value) // undefined

counter.value = 'World'

console.log(previous.value) // Hello

类型声明

/**
 * 保存 ref 的前一个值。
 *
 * @see   {@link https://vueuse.org/usePrevious}
 */
export declare function usePrevious<T>(
  value: MaybeRefOrGetter<T>,
): Readonly<Ref<T | undefined>>
export declare function usePrevious<T>(
  value: MaybeRefOrGetter<T>,
  initialValue: T,
): Readonly<Ref<T>>

源码

源码 • 文档

贡献者

Anthony Fu

一纸忘忧

Anthony Fu

更新日志

v10.0.0-beta.4 on 4/13/2023

4d757 - feat(types)!: rename MaybeComputedRef to MaybeRefOrGetter

10e98 - feat(toRef)!: rename resolveRef to toRef

v9.12.0 on 1/29/2023

e101f - feat: new function