如何在Angular 7App初始化前清除LocalStorage

import { Injectable, APP_INITIALIZER } from '@angular/core';
import { LocalStorageService } from './local-storage.service';

@Injectable()
export class AppInitializerService {
  constructor(private localStorageService: LocalStorageService) {}

  clearLocalStorage(): Promise<any> {
    return this.localStorageService.clear(); // 假设LocalStorageService中有一个clear方法用于清除LocalStorage
  }
}

export function initApp(appInitializerService: AppInitializerService): () => Promise<any> {
  return () => appInitializerService.clearLocalStorage();
}

export const appInitializerProviders = [
  AppInitializerService,
  {
    provide: APP_INITIALIZER,
    useFactory: initApp,
    deps: [AppInitializerService],
    multi: true
  }
];

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { appInitializerProviders } from './app-initializer.service';

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule],
  providers: [appInitializerProviders],
  bootstrap: [AppComponent]
})
export class AppModule {}