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| 1.需要实现HttpInterceptor接口
@Injectable()
export class SignInterceptor implements HttpInterceptor {
intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>{
...
}
}
2.暴露拦截器链
import { HTTP_INTERCEPTORS } from '@angular/common/http';
import {SignInterceptor} from './sign.interceptor';
//multi:true 表示有多个拦截器
export const httpInterceptorProviders = [
{provide: HTTP_INTERCEPTORS, useClass: SignInterceptor, multi: true},
];
3.在模块中使用拦截器
@NgModule({
declarations: [...],
imports: [...],
providers: [httpInterceptorProviders]
})
|