watchOnce

分类

Watch

导出大小

140 B

上次更改

4 个月前

watch 只触发一次。

用法

在回调函数被触发一次后，watch 将会自动停止。

import { watchOnce } from '@vueuse/core'

watchOnce(source, () => {
  // triggers only once
  console.log('source changed!')
})

类型声明

typescript

export declare function watchOnce<
  T extends Readonly<WatchSource<unknown>[]>,
  Immediate extends Readonly<boolean> = false,
>(
  source: [...T],
  cb: WatchCallback<MapSources<T>, MapOldSources<T, Immediate>>,
  options?: WatchOptions<Immediate>,
): WatchStopHandle
export declare function watchOnce<
  T,
  Immediate extends Readonly<boolean> = false,
>(
  sources: WatchSource<T>,
  cb: WatchCallback<T, Immediate extends true ? T | undefined : T>,
  options?: WatchOptions<Immediate>,
): WatchStopHandle