environments                                          
├── environment.prod.ts                  // 生產(chǎn)環(huán)境使用的配置
└── environment.ts                       // 開(kāi)發(fā)環(huán)境使用的配置

// enviroment.ts

export const environment = {
  baseUrl: '',
  production: false
};

// http-interceptor.service.ts

import { Injectable } from '@angular/core';
import {
  HttpEvent,
  HttpHandler,
  HttpInterceptor, // 攔截器
  HttpRequest, // 請(qǐng)求
} from '@angular/common/http';

import { Observable } from 'rxjs';
import { tap } from 'rxjs/operators';

import { environment } from 'src/environments/environment';

@Injectable({
  providedIn: 'root'
})
export class HttpInterceptorService implements HttpInterceptor {

  constructor() { }

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    let secureReq: HttpRequest<any> = req;

    secureReq = secureReq.clone({
      url: environment.baseUrl + req.url
    });

    return next.handle(secureReq).pipe(
      tap(
        (response: any) => {
          // 處理響應(yīng)的數(shù)據(jù)
          console.log(response)
        },
        (error: any) => {
          // 處理錯(cuò)誤的數(shù)據(jù)
          console.log(error)
        }
      )
    )
  }
}

// app.module.ts

import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
// 攔截器服務(wù)
import { HttpInterceptorService } from './services/http-interceptor.service';

providers: [
  // 依賴(lài)注入
  {
    provide: HTTP_INTERCEPTORS,
    useClass: HttpInterceptorService,
    multi: true,
  }
],

let secureReq: HttpRequest<any> = req;
// ...
// 使用 localhost 存儲(chǔ)用戶(hù)憑證，在請(qǐng)求頭帶上
if (window.localStorage.getItem('ut')) {
  let token = window.localStorage.getItem('ut') || ''
  secureReq = secureReq.clone({
    headers: req.headers.set('token', token)
  });
}

// ...