• 参考地址: https://semlinker.com/ng-http-interceptor/

• 实现(request.service)

  import { Injectable } from "@angular/core";
  import { Observable, of, throwError } from "rxjs";
  import { catchError, map, tap } from "rxjs/operators";
  import {HttpHeaders,HttpClient,HttpRequest,HttpHandler,HttpErrorResponse,HttpEvent,HttpResponse,HttpInterceptor,
  } from "@angular/common/http";
  import Config from "../../config/index";@Injectable({providedIn: "root",
  })
  export class RequestService implements HttpInterceptor {constructor(private http: HttpClient) {}/*** 错误消息类* @param error*/private handleError(error: HttpErrorResponse) {console.log(error, "res112212");if (error.error instanceof ErrorEvent) {console.error("An error occurred:", error.error.message);} else {console.error(`Backend returned code ${error.status}, ` + `body was: ${error.error}`);}return throwError("Something bad happened; please try again later.");}intercept(request: HttpRequest<any>,next: HttpHandler): Observable<HttpEvent<any>> {return next.handle(request).pipe(map((event: HttpEvent<any>) => {if (event instanceof HttpResponse) {console.log(event.body.code, "code");switch (event.body.code) {case 200:break;case 401:localStorage.removeItem("token");window.location.href = "/login";break;case 500:// this.OpenMessage('提示', '数据错误500')break;}}return event;}));}
  }

• app.module.ts

  providers: [// 添加{ provide: HTTP_INTERCEPTORS, useClass: RequestService, multi: true },],