TypeError: rxjs__WEBPACK_IMPORTED_MODULE_2__.Observable.throw is not a function

Question

这是我的文件 userdata.service.ts :

import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
import {Observable} from 'rxjs';
import { map } from "rxjs/operators";
import { catchError } from 'rxjs/operators';
import { Data } from './userdata';

@Injectable()
export class UserDataService {

  url : "http://localhost:4200/assets/data/userdata.json";
  constructor(private http:Http) { }  

  getDataWithObservable() : Observable<any>{
      return this.http.get(this.url)
            .pipe(
              map(this.extractData),
              catchError(this.handleErrorObservable)
            );
  }

    private extractData(res: Response) 
    {
        let body = res.json();      
        return body;
    }

    private handleErrorObservable (error: Response | any) 
    {   
        return Observable.throw(error.message || error);
    }
}

我收到以下错误：

TypeError: rxjs__WEBPACK_IMPORTED_MODULE_2__.Observable.throw is not a function

Answer 1

Observable.throw() has been deleted.

尝试使用 Observable.throwError()。显然这些定义还不是最新的。

您可以使用 import { throwError } from 'rxjs';

导入它

Answer 2

导入：

import { throwError } from 'rxjs';

用法：

return throwError(err);

Answer 3

在Angular8中使用

throwError(new NotFoundError("Resource Not Found."))

不要使用

Observable.throw(new NotFoundError("Resource Not Found."))

完整示例

catchError((error:Response) => {
    if(error.status === 404) {
      return throwError(new NotFoundError("Resource Not Found."));
    }
    return throwError(new AppError(error));
});

TypeError: rxjs__WEBPACK_IMPORTED_MODULE_2__.Observable.throw is not a function

TypeError: rxjs__WEBPACK_IMPORTED_MODULE_2__.Observable.throw is not a function

rxjs

angular

angular6