watchArray

分类

侦听

导出大小

303 B

上次更改

8 个月前

监听数组的添加和删除。

用法

与 watch 类似，但将添加和删除的元素提供给回调函数。如果列表通过 push、splice 等方法原地更新，请传递 { deep: true }。

import { watchArray
 } from '@vueuse/core'

const list
 = ref
([1, 2, 3])

watchArray
(list
, (newList
, oldList
, added
, removed
) => {
  console
.log
(newList
) // [1, 2, 3, 4]
  console
.log
(oldList
) // [1, 2, 3]
  console
.log
(added
) // [4]
  console
.log
(removed
) // []
})

onMounted
(() => {
  list
.value
 = [...list
.value
, 4]
})

类型声明

export declare type WatchArrayCallback
<V
 = any, OV
 = any> = (
  value
: V
,
  oldValue
: OV
,
  added
: V
,
  removed
: OV
,
  onCleanup
: (cleanupFn
: () => void) => void,
) => any
/**
 * Watch for an array with additions and removals.
 *
 * @see https://vueuse.org.cn/watchArray
 */
export declare function watchArray
<
  T
,
  Immediate
 extends Readonly
<boolean> = false,
>(
  source
: WatchSource
<T
[]> | T
[],
  cb
: WatchArrayCallback
<T
[], Immediate
 extends true ? T
[] | undefined : T
[]>,
  options
?: WatchOptions
<Immediate
>,
): WatchHandle