example:Observable<number> = from([1, 2, 20, 50]) constructor() { this.example.pipe(map(v => v*2)).subscribe( data => console.log(data) ) } } 输出的结果: :可以tap操作符做一下区分,tap操作符对源 Observable 上的每个发出值进行监听,做额外处理,但返回源相同的 Observable。输入和输出数...
Example #2Source File: logging.interceptor.ts From 42_checkIn with GNU General Public License v3.0 6 votes intercept(context: ExecutionContext, next: CallHandler): Observable<any> { const now = Date.now(); return next .handle() .pipe( tap(() => this.logger.log( context.switchToHttp(...
import { retry } from 'rxjs/operators'; ajax('https://example.com/api/data').pipe( // 最多重新订阅 3 次,如果仍然失败,则输出错误信息 retry(3) ).subscribe( response => console.log(response), error => console.log('Request failed after multiple attempts:', error) ); 观察者 - 订阅可...
import { concatMap, tap, retryWhen, map, delay } from 'rxjs/operators';let cnt = 0;const source = fromEvent(document, 'click').pipe(map(() => cnt++)); const example = source.pipe( concatMap((val) => defer(() => simulateHttpRequest(val)).pipe( ...
getLocalOracleName(pubkey: string) { console.debug('getLocalOracleName()', pubkey) return zip(this.getOracleName(pubkey), this.messageService.sendMessage(getMessageBody(MessageType.getoraclename))) .pipe(tap(arr => { const result = arr[0] const result2 = arr[1] let osOracleName: string...
tap 透明地执行操作或副作用,比如打印日志。 1import { of } from 'rxjs';2import { tap, map } from 'rxjs/operators';34const source = of(1, 2, 3, 4, 5);5//使用 tap 透明地打印 source 中的值6const example =source.pipe(7tap(val =>console.log(`BEFORE MAP: ${val}`)),8map(val...
import { retry } from 'rxjs/operators';ajax('https://example.com/api/data').pipe( // 最多重新订阅 3 次,如果仍然失败,则输出错误信息 retry(3) ).subscribe( response => console.log(response), error => console.log('Request failed after multiple attempts:', error) ...
import { take, tap } from 'rxjs/operators'; @Component({ selector: 'app-example', templateUrl: './example.component.html', }) export class ExampleComponent implements OnInit { data: any[]; constructor(private http: HttpClient) {}
9 const subscribe = example.subscribe(val => console.log(val)); 1. 2. 3. 4. 5. 6. 7. 8. 9. 1 import { skip } from 'rxjs/operators'; 2 3 // 每1秒发出值 4 const source = interval(1000); 5 // 跳过前5个发出值 6 const example = source.pipe(skip(5)); ...
tap, finalize, map, delay, share, } from 'rxjs/operators';const log = <T>(source: Observable<T>, name: string) => defer(() => { console.log(`${name}: subscribed`); return source.pipe( tap({ next: (value) => console.log(`${name}: ${value}`), ...