from / fromEvent

RxJS 的 from() 和 fromEvent() 的包装器，使它们能够接受 ref。 Available in the @vueuse/rxjs add-on.

用法

TypeScript

import { from, fromEvent, toObserver, useSubscription } from '@vueuse/rxjs'
import { interval } from 'rxjs'
import { map, mapTo, takeUntil, withLatestFrom } from 'rxjs/operators'
import { ref } from 'vue'

const count = ref(0)
const button = ref<HTMLButtonElement>(null)

useSubscription(
  interval(1000)
    .pipe(
      mapTo(1),
      takeUntil(fromEvent(button, 'click')),
      withLatestFrom(from(count, {
        immediate: true,
        deep: false,
      })),
      map(([curr, total]) => curr + total),
    )
    .subscribe(toObserver(count)), // 与 ).subscribe(val => (count.value = val)) 相同
)

import { from, fromEvent, toObserver, useSubscription } from '@vueuse/rxjs'
import { interval } from 'rxjs'
import { map, mapTo, takeUntil, withLatestFrom } from 'rxjs/operators'
import { ref } from 'vue'
const count = ref(0)
const button = ref(null)
useSubscription(
  interval(1000)
    .pipe(
      mapTo(1),
      takeUntil(fromEvent(button, 'click')),
      withLatestFrom(
        from(count, {
          immediate: true,
          deep: false,
        }),
      ),
      map(([curr, total]) => curr + total),
    )
    .subscribe(toObserver(count)),
)

类型声明

typescript

export declare function from<T>(
  value: ObservableInput<T> | Ref<T>,
  watchOptions?: WatchOptions,
): Observable<T>
export declare function fromEvent<T extends HTMLElement>(
  value: MaybeRef<T>,
  event: string,
): Observable<Event>