新建拦截器，设置 XMLHttpRequest：withCredentials 属性

1. 新建文件夹 http-interceptors

该文件夹下可有多个不同用途的拦截器

2. 新建拦截器 common.interceptor.ts

import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from "@angular/common/http";
import { Injectable } from "@angular/core";
import { Observable } from "rxjs";@Injectable()
export class CommonInterceptor implements HttpInterceptor {intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {return next.handle(req.clone({withCredentials: true}));}

3. 用一个数组汇总起来，统一引入： index.ts （后续需要添加拦截器，只需加入到该数组即可）

import { HTTP_INTERCEPTORS } from "@angular/common/http";
import { CommonInterceptor } from "./common.interceptor";export const httpInterceptorProvides = [{provide: HTTP_INTERCEPTORS,useClass: CommonInterceptor,  //指定使用哪个拦截器multi: true  //表示可设置多个拦截器}
]

4. 引入拦截器使用: service.module.ts

import { isPlatformBrowser } from '@angular/common';
import { InjectionToken, NgModule, PLATFORM_ID } from '@angular/core';
import { httpInterceptorProvides } from './http-interceptors';export const API_CONFIG = new InjectionToken('ApiConfigToken');
export const WINDOW = new InjectionToken('WindowToken');@NgModule({declarations: [],imports: [],providers: [{provide: API_CONFIG,useValue: 'http://localhost:3000/'},{provide: WINDOW,useFactory(platformId: Object): Window | Object {return isPlatformBrowser(platformId) ? window : {};},deps: [PLATFORM_ID]},httpInterceptorProvides]
})
export class ServicesModule { }