Angular 6功能模块:拦截器未触发

import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpRequest, HttpHandler, HttpEvent } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable()
export class MyInterceptor implements HttpInterceptor {
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // 在发送请求之前进行处理
    // 可以修改请求头、请求参数等

    return next.handle(request).pipe(
      // 在响应返回之前进行处理
      // 可以修改响应数据、处理错误等
    );
  }
}

import { NgModule } from '@angular/core';
import { HTTP_INTERCEPTORS } from '@angular/common/http';
import { MyInterceptor } from './my-interceptor';

@NgModule({
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: MyInterceptor,
      multi: true
    }
  ]
})
export class AppModule { }

import { Component } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-example',
  template: `
    <button (click)="makeRequest()">发送请求</button>
  `
})
export class ExampleComponent {
  constructor(private http: HttpClient) {}

  makeRequest() {
    this.http.get('https://api.example.com/data', {
      // 可选的HttpInterceptorOptions对象
    }).subscribe(response => {
      // 处理响应数据
    });
  }
}