Angular のプリロード構成と遅延ロード構成に関する簡単な説明

@NgModule({ 
　　declarations: [], //属于当前模块的组件、指令及管道
　　imports: [], //当前模板所依赖的项，即外部模块（包括httpModule、路由等）
　　export:[],//声明出应用给其他的module使用
　　providers: [], //注入服务到当前模块
　　bootstrap: []//默认启动哪个组件(只有根模块才能设置bootstrap属性)
})

//使用默认预加载-预加载全部模块
import { NgModule } from '@angular/core'; 
import { AppComponent } from './app.component'; 
import { routes } from './main.routing'; 
import { RouterModule } from '@angular/router'; 
import { PreloadAllModules } from '@angular/router'; 
@NgModule({ 
　　declarations: [AppComponent], 
　　imports: [ BrowserModule, RouterModule.forRoot(routes, { preloadingStrategy: PreloadAllModules }) ], 
　　providers: [], 
　　bootstrap: [AppComponent] }) 
export class AppModule { }

import { Route } from '@angular/router';
import { PreloadingStrategy } from '@angular/router';
import { Observable } from 'rxjs/Rx';

export class CustomPreloadingStrategy implements PreloadingStrategy {
    preload(route: Route, fn: () => Observable): Observable {
        return Observable.of(true).delay(5000).flatMap((_: boolean) => fn());
    }
}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppComponent } from './app.component';
import { HomeComponent } from './home/home.component';
import { routes } from './main.routing';
import { RouterModule } from '@angular/router';
import { CustomPreloadingStrategy } from './preload';

@NgModule({
  declarations: [
    AppComponent,
    HomeComponent
  ],
  imports: [
    BrowserModule,
    RouterModule.forRoot(routes, { preloadingStrategy:  CustomPreloadingStrategy })
  ],
  providers: [CustomPreloadingStrategy ],
  bootstrap: [AppComponent]
})
export class AppModule { }

import { Injectable } from '@angular/core';
import { PreloadingStrategy, Route } from '@angular/router';
import { Observable} from 'rxjs/Observable';
import 'rxjs/add/observable/of';
@Injectable()
export class SelectivePreloadingStrategy implements PreloadingStrategy {
  preloadedModules: string[] = [];

  preload(route: Route, load: () => Observable): Observable {
    if (route.data && route.data['preload']) {
      return load();
    } else {
      return Observable.of(null);
    }
  }
}

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { CanDeactivateGuard } from './guard/can-deactivate-guard.service';
import { SelectivePreloadingStrategy } from './selective-preloading-strategy'; // 预加载
import { PageNotFoundComponent } from './not-found.component';
const appRoutes: Routes = [
{ path: '', redirectTo: 'home', pathMatch: 'full'},
{ path: 'mian', loadChildren: './main/mian.module#MainModule' }, // 懒加载(在这个层级的router配置文件及module文件都不需要引入该组建)
{ path: 'home', loadChildren: './home/home.module#HomeModule', data: { preload: true } }, // 懒加载 + 预加载
{ path: '**', component: PageNotFoundComponent } // 注意要放到最后
];
@NgModule({
　　imports: [
　　　　RouterModule.forRoot(appRoutes,{
　　　　　　enableTracing: true, // <-- debugging purposes only
　　　　　　preloadingStrategy: SelectivePreloadingStrategy // 预加载
　　　　})
　　],
　　exports: [
　　　　RouterModule
　　],
　　providers: [
　　　　CanDeactivateGuard,
　　　　SelectivePreloadingStrategy
　　]
})
export class AppRoutingModule { }

import {NgModule} from '@angular/core';
import {RouterModule, Routes} from '@angular/router';
import {MainComponent} from './main.component';
import{AComponent} from './A/A.component';
import{BComponent} from './B/B.component';
const mainRoute: Routes = [
  {
    path: '',
    component: MainComponent,
    data: {
      title: '面试预约',
    },
    children: [
      {
        path: '',//path为空表示默认路由
        component: AComponent,
        data: {
          title: '大活动',
        }
      },
      {
        path: 'activity',
        component: BComponent,
        data: {
          title: '中活动',
        }
      }
    ]
  }
];


@NgModule({
  imports: [
    RouterModule.forChild(mainRoute)
  ],
  exports: [
    RouterModule
  ]
})
export class MainRoutingModule{
}

import { AppService } from './../../app.service';
import { Observable } from 'rxjs/Observable';
import { Injectable } from '@angular/core';
import { HttpParams } from '@angular/common/http';
import { PageData, ActivitysManage } from './model/activitys-manage';
import { BehaviorSubject } from 'rxjs';
import {PageDataBig, ActivitySmall, PageDataSmall } from './model/activitys-manage';
@Injectable()
export class MainService {
  
}

import { FormsModule } from '@angular/forms';
import { CommonModule } from '@angular/common';
import { MainComponent } from './interview-appointment.component';
import { AComponent } from './A/A.component';
import { BComponent } from './B/B.component';
import { NgModule } from '@angular/core';
import { CoreFrameCommonModule } from '../../common/common.module';
import { MainRoutingModule } from './main-routing.module';
import { NgZorroAntdModule } from '../../zorro/ng-zorro-antd.module';
import { MainService } from './interview-appointment.service';
@NgModule({
  imports: [FormsModule,CoreFrameCommonModule, CommonModule, MainRoutingModule,NgZorroAntdModule],
  exports: [],
  declarations: [MainComponent,AComponent,BComponent],
  providers: [MainService],
})
export class MainModule{ }