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usePrevious

保存 ref 的前一个值。

¥Holds the previous value of a ref.

用法

¥Usage

ts
import { usePrevious } from '@vueuse/core'
import { shallowRef } from 'vue'

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

console.log(previous.value) // undefined

counter.value = 'World'

console.log(previous.value) // Hello