watchOnce

watch 仅触发一次。

¥watch that only triggers once.

用法

¥Usage

回调函数触发一次后，监视会自动停止。

¥After the callback function has been triggered once, the watch will be stopped automatically.

import { watchOnce } from '@vueuse/core'

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

类型声明

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

源代码

源代码 • 文档

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