RxJS startWith

返回一個(gè) Observable，它在開始發(fā)出源 Observable 發(fā)出的項(xiàng)目之前，發(fā)出您指定為參數(shù)的項(xiàng)目。

startWith<T, D>(...array: (SchedulerLike | T)[]): OperatorFunction<T, T | D>

參量

returns

OperatorFunction<T, T | D>：一個(gè) Observable，它發(fā)出指定的 Iterable 中的項(xiàng)目，然后發(fā)出由源 Observable 發(fā)出的項(xiàng)目。

描述

首先按順序發(fā)出其參數(shù)，然后從源發(fā)出任何信號(hào)。

例子

從開始排放鏈"first"，"second"

import { of } from 'rxjs';
import { startWith } from 'rxjs/operators';


of("from source")
  .pipe(startWith("first", "second"))
  .subscribe(x => console.log(x));


// results:
//   "first"
//   "second"
//   "from source"

超載

startWith(scheduler: SchedulerLike): MonoTypeOperatorFunction<T>

returnsMonoTypeOperatorFunction<T>

startWith(v1: D, scheduler: SchedulerLike): OperatorFunction<T, T | D>

returnsOperatorFunction<T, T | D>

startWith(v1: D, v2: E, scheduler: SchedulerLike): OperatorFunction<T, T | D | E>

returnsOperatorFunction<T, T | D | E>

startWith(v1: D, v2: E, v3: F, scheduler: SchedulerLike): OperatorFunction<T, T | D | E | F>

returnsOperatorFunction<T, T | D | E | F>

startWith(v1: D, v2: E, v3: F, v4: G, scheduler: SchedulerLike): OperatorFunction<T, T | D | E | F | G>

returnsOperatorFunction<T, T | D | E | F | G>

startWith(v1: D, v2: E, v3: F, v4: G, v5: H, scheduler: SchedulerLike): OperatorFunction<T, T | D | E | F | G | H>

returnsOperatorFunction<T, T | D | E | F | G | H>

startWith(v1: D, v2: E, v3: F, v4: G, v5: H, v6: I, scheduler: SchedulerLike): OperatorFunction<T, T | D | E | F | G | H | I>

returnsOperatorFunction<T, T | D | E | F | G | H | I>

startWith(v1: D): OperatorFunction<T, T | D>

returnsOperatorFunction<T, T | D> startWith(v1: D, v2: E): OperatorFunction<T, T | D | E>

returnsOperatorFunction<T, T | D | E>

startWith(v1: D, v2: E, v3: F): OperatorFunction<T, T | D | E | F>

returnsOperatorFunction<T, T | D | E | F>

startWith(v1: D, v2: E, v3: F, v4: G): OperatorFunction<T, T | D | E | F | G>

returnsOperatorFunction<T, T | D | E | F | G>

startWith(v1: D, v2: E, v3: F, v4: G, v5: H): OperatorFunction<T, T | D | E | F | G | H>

returnsOperatorFunction<T, T | D | E | F | G | H>

startWith(v1: D, v2: E, v3: F, v4: G, v5: H, v6: I): OperatorFunction<T, T | D | E | F | G | H | I>

returnsOperatorFunction<T, T | D | E | F | G | H | I>

startWith(...array: D[]): OperatorFunction<T, T | D>

returnsOperatorFunction<T, T | D>

startWith(...array: (SchedulerLike | D)[]): OperatorFunction<T, T | D>

returnsOperatorFunction<T, T | D>