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watchArray

观察有添加和删除的数组。

¥Watch for an array with additions and removals.

用法

¥Usage

watch 类似,但向回调函数提供添加和删除的元素。如果列表已更新为 pushsplice 等,则通过 { deep: true }

¥Similar to watch, but provides the added and removed elements to the callback function. Pass { deep: true } if the list is updated in place with push, splice, etc.

ts
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]
})