IE 11上的Angular 7.2无法构造HTTP GET参数

Question

我在Angular 7.2.0应用程序的HTTP get请求中使用HttpParams。使用“ ng build --extract-css --aot”命令构建项目后，运行该应用程序并在控制台上记录HttpParams值，我可以在控制台上看到该参数值，但是该值未反映在http中网络标签上的请求。请给我建议。

此解决方案在Chrome中可以正常运行，只有在使用IE时，我才会遇到此问题。

我尝试了带有和不带有“ application / json”标头的相同方法，但是没有区别。

我在启用所有polyfill的情况下进行了尝试，但也无法解决问题。

analytics.service.ts

import { ErrorsService } from 'src/app/shared/services/errors.service';
import { Observable } from 'rxjs';
import { Activity } from 'src/app/models/Activity';
import { HttpParams, HttpClient, HttpHeaders } from '@angular/common/http';
import { catchError } from 'rxjs/operators';


@Injectable()
export class AnalyticsService {
  routePrefix = 'api/analytics';

  constructor(private http: HttpClient, private errorsService: ErrorsService) { }

  public getSessionActivities(duration): Observable<Activity[]> {
    let headers = new HttpHeaders();
    headers.append('Content-Type', 'application/json');

    const requestParams = new HttpParams().set('duration', duration);
    console.log("---Get Session Activities---", requestParams);

    return this.http.get<Activity[]>(this.routePrefix, { headers: headers, params: requestParams }).pipe(
      catchError(err => this.errorsService.handleError(err))
    );
  }
}
import { Injectable } from '@angular/core';
import { ErrorsService } from 'src/app/shared/services/errors.service';
import { Observable } from 'rxjs';
import { Activity } from 'src/app/models/Activity';
import { HttpParams, HttpClient, HttpHeaders } from '@angular/common/http';
import { catchError } from 'rxjs/operators';


@Injectable()
export class AnalyticsService {
  routePrefix = 'api/analytics';

  constructor(private http: HttpClient, private errorsService: ErrorsService) { }

  public getSessionActivities(duration): Observable<Activity[]> {
    let headers = new HttpHeaders();
    headers.append('Content-Type', 'application/json');

    const requestParams = new HttpParams().set('duration', duration);
    console.log("---Get Session Activities---", requestParams);

    return this.http.get<Activity[]>(this.routePrefix, { headers: headers, params: requestParams }).pipe(
      catchError(err => this.errorsService.handleError(err))
    );
  }
}

.NET核心后端

IE网络标签

IE控制台

Chrome网络标签

角度版本

IE版本

Answer 1

我能够通过添加一些默认未添加到polyfills.ts的额外polyfill来解决此问题。功劳应该归功于“ core-js / es7 / reflect”。请参阅下面的polyfills.ts的完整内容。

 * This file includes polyfills needed by Angular and is loaded before the app.
 * You can add your own extra polyfills to this file.
 *
 * This file is divided into 2 sections:
 *   1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
 *   2. Application imports. Files imported after ZoneJS that should be loaded before your main
 *      file.
 *
 * The current setup is for so-called "evergreen" browsers; the last versions of browsers that
 * automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
 * Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
 *
 * Learn more in https://angular.io/docs/ts/latest/guide/browser-support.html
 */

/***************************************************************************************************
 * BROWSER POLYFILLS
 */

/** IE9, IE10 and IE11 requires all of the following polyfills. **/
 import 'core-js/es6/symbol';
 import 'core-js/es6/object';
 import 'core-js/es6/function';
 import 'core-js/es6/parse-int';
 import 'core-js/es6/parse-float';
 import 'core-js/es6/number';
 import 'core-js/es6/math';
 import 'core-js/es6/string';
 import 'core-js/es6/date';
 import 'core-js/es6/array';
 import 'core-js/es6/regexp';
 import 'core-js/es6/map';
 import 'core-js/es6/weak-map';
 import 'core-js/es6/set';

/** IE10 and IE11 requires the following for NgClass support on SVG elements */
 import 'classlist.js';  // Run `npm install --save classlist.js`.

/** IE10 and IE11 requires the following for the Reflect API. */
 import 'core-js/es6/reflect';


/** Evergreen browsers require these. **/
// Used for reflect-metadata in JIT. If you use AOT (and only Angular decorators), you can remove.
import 'core-js/es7/reflect';


/**
 * Web Animations `@angular/platform-browser/animations`
 * Only required if AnimationBuilder is used within the application and using IE/Edge or Safari.
 * Standard animation support in Angular DOES NOT require any polyfills (as of Angular 6.0).
 **/
// import 'web-animations-js';  // Run `npm install --save web-animations-js`.

/**
 * By default, zone.js will patch all possible macroTask and DomEvents
 * user can disable parts of macroTask/DomEvents patch by setting following flags
 */

 // (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch requestAnimationFrame
 // (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
 // (window as any).__zone_symbol__BLACK_LISTED_EVENTS = ['scroll', 'mousemove']; // disable patch specified eventNames

 /*
 * in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
 * with the following flag, it will bypass `zone.js` patch for IE/Edge
 */
// (window as any).__Zone_enable_cross_context_check = true;

/***************************************************************************************************
 * Zone JS is required by default for Angular itself.
 */
import 'zone.js/dist/zone';  // Included with Angular CLI.



/***************************************************************************************************
 * APPLICATION IMPORTS
 */

谢谢。