angular2 ルーティングのプリロード例の詳細な説明

import { PreloadingStrategy, Route } from "@angular/router";
import { Observable } from "rxjs";
/**
 * 预加载策略
 */
export class SelectivePreloadingStrategy implements PreloadingStrategy {
  preload(route: Route, load: Function): Observable<any> {
    //当路由中配置data: {preload: true}时预加载
    return route.data && route.data && route.data[&#39;preload&#39;] ? load() : Observable.of(null);
  }

}

import { NgModule }       from '@angular/core';
import { RouterModule, Routes } from '@angular/router';

import {SelectivePreloadingStrategy} from "./selective-preloading-strategy";

import { LoginComponent }   from './login/login.component';
import { MainComponent }  from './main/main.component';



/**
 * app路由
 */
const routes: Routes = [
 { path: '', redirectTo: '/login', pathMatch: 'full' },
 { 
   path: 'login', 
   component: LoginComponent
 },
 { 
   path: 'app', 
   component: MainComponent,
   loadChildren: 'app/main/main.module#MainModule',
   data: {preload: true}
 }
];

export const appRoutes=RouterModule.forRoot(routes,{preloadingStrategy: SelectivePreloadingStrategy});

/**
 * app模块
 */
@NgModule({
 imports: [
  appRoutes,
  BrowserModule,
  BrowserAnimationsModule,
  NgbModule.forRoot(),
  MainModule,
  LoginModule
 ],
 declarations: [
  AppComponent,
  ToastBoxComponent,
  ToastComponent,
  SpinComponent
 ],
 providers: [AppService,ToastService,HttpService,SpinService,SelectivePreloadingStrategy],
 exports:[ToastBoxComponent,SpinComponent],
 bootstrap: [ AppComponent ]
})
export class AppModule {}

import { NgModule, OnInit } from '@angular/core';
import { RouterModule, Routes, Router } from '@angular/router';

/**
 * 主体路由
 */
const routes: Routes = [
   { path: 'home', loadChildren: 'app/home/home.module#HomeModule', data: {preload: true} },
   { path: 'demo', loadChildren: 'app/demo/demo.module#DemoModule', data: {preload: true} },
];

export const mainRoutes = RouterModule.forChild(routes);