watchArray
观察有添加和删除的数组。
¥Watch for an array with additions and removals.
用法
¥Usage
与 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 push
、splice
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]
})