subscriber.error('error message'); }); obs .pipe( catchError(error=>{ console.log(error);//error messagereturnof('succeeded'); }) ) .subscribe({ next: value=> console.log(value),//succeedederror: errorMessage => console.log(errorMessage),//won't call}); catchError 接收到 error 后,...
catchError(error => { console.log('Handling error locally and rethrowing it...', error); return throwError(error); }) ) .subscribe( res => console.log('HTTP response', res), error => console.log('HTTP Error', error), () => console.log('HTTP request completed.') ); 捕捉并重新...
source$ .pipe( map((value) => value * 2), map((value) => value + 1) ) .subscribe(console.log);你可以打开 codesandbox 直接查看结果在看一个 filter 操作符, 想象一个需求 输出给定序列中所有的偶数:import { of } from "rxjs";import { map, filter } from "rxjs/operators";const source$...
subject.pipe(materialize()).subscribe({ next: v=>console.log(v), complete: ()=> console.log('complete'),//never be callederror: e => console.log('error', e),//never be called}); subject.next('value');//console: { kind: 'N', value: 'value', error: undefined, hasValue: true...
对数据流的预处理,这是两步之外的,但还是希望一起讲。对数据的预处理,new Observable产生的发出数据流对象之前,可以调用pipe方法来对数据进行预处理叫做Operators操作符。注意⚠️,每一个操作符都会返回一个全新的Observable对象 source$.pipe( take(5), // 只要前五个 ...
mapretryajaxletall_nums=of(1,6,5,10,9,20,10);letfinal_val=ajax('http://localhost:8081/getData').pipe(retry(4));final_val.subscribe(x=>console.log(x),=>console.error(err),()=>console.log("Task Complete")); In the example, we are making a call to a url using ajax. The url...
import{throwError,of}from'rxjs';import{handleError,unwrapSuccess,unwrapError}from'rxjs-errors';constmyStream$=of('some value').pipe(handleError(),);myStream$.subscribe(value=>console.log(value),// { type: 'SuccessWrapper', value: 'some value' }error=>console.log(error),// never called...
[RxJS 6] The Retry RxJs Error Handling Strategy When we want to handle error observable in RxJS v6+, we can use 'retryWhen' and 'delayWhen': constcourses$: Observable<Counse[]> =http$ .pipe( tap(()=> console.log("HTTP request")),...
这个subject 拥有 Observer 的 next、error、complete 方法,每次被观察者订阅时都会在内部保存这个观察者。当接收到源数据流的数据时,会把数据发送给每一个观察者。 const source$ = interval(1000).pipe( map(x => Math.floor(Math.random() * 10)), take(3) ) const observerA = { next: x => conso...
bite(event:MouseEvent):Observable<{x:number,y:number}> {returnof({x:0,y:0}) .pipe(map(loc=>{return{x:this.getX(event),y:this.getY(event) }; }),catchError(error=>{// Handle our error here...console.error(error);returnof({x:0,y:0});// Return our default location!}); );...