Question

我在Angular 5项目上有以下循环依赖性错误，我不明白为什么。我从token.service.ts中删除路由器依赖项时修复了错误，但我需要它。我在代码中尝试做的是在应用程序初始化期间调用一个方法这就是我所拥有的：

app.modules.ts

import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { NgModule } from '@angular/core';
import { HttpModule } from '@angular/http';
import { HttpClientModule, HttpClient } from '@angular/common/http';
import { SearchEngineModule } from './search-engine/search-engine.module';
import { AppLoadModule } from './app-load/app-load.module';
import { AppLoadService } from './app-load/app-load.service';
import { AppComponent } from './app.component';
import { SearchService } from './search-engine/search.service';
import { AppRoutingModule } from './app-routing.module';
import { Routes, RouterModule } from '@angular/router';
import { SearchListComponent } from './search-engine/search-list/search-list.component';
import { TokenService } from './token.service';

const routes: Routes = [
  {
    path: 'searchList',
    component: SearchListComponent
  }
];

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule,
    HttpModule,
    AppLoadModule,
    SearchEngineModule,
    RouterModule.forRoot(routes, { useHash: true })
  ],
  providers: [ TokenService , AppLoadService],
  bootstrap: [ AppComponent ]
})
export class AppModule { }

APP-load.module.ts

import { NgModule, APP_INITIALIZER} from '@angular/core';
import { AppLoadService } from './app-load.service';
import { CommonModule } from '@angular/common';

export function init_app(appLoadService: AppLoadService) {
  return () => appLoadService.initializeApp();
}

@NgModule({
  imports: [
    CommonModule
  ],
  providers: [
    { provide: APP_INITIALIZER, 
      useFactory: init_app, 
      deps: [AppLoadService], 
      multi: true 
    }
  ],
  declarations: []
})
export class AppLoadModule { }

APP-load.service.ts

import { Injectable } from '@angular/core';
import { TokenService } from '../token.service';

@Injectable()
export class AppLoadService {

  constructor(private tokenService: TokenService) { }

  initializeApp(): Promise<any> {
    return new Promise((resolve, reject) => {
      setTimeout(() => {
        this.tokenService.obtainAccessToken();
        resolve();
      }, 3000);
    });
  }
}

token.service.ts

import { Injectable } from '@angular/core';
import { Router } from "@angular/router";
import { Cookie } from 'ng2-cookies';
import { Http, Response, Headers, RequestOptions } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/map';


@Injectable()
export class TokenService {

  constructor(private router: Router, private _http: Http) { }

  obtainAccessToken() {
    // some code
    this.router.navigate(['/']);
  }
}

有人可以提出任何建议吗？提前致谢

角度路由器循环依赖性错误

0 个答案: