Angular 2和systemjs:如何导入在运行时创建的app.module.ts文件？

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

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

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

declare var System: any;

@NgModule({
  imports: [BrowserModule],
  declarations: [AppComponent],
  bootstrap: [AppComponent]
})
export class AppModule {
  constructor() {
    System.import('./dynamic/app.module').then((module: any) => {
      // 动态加载成功后，将动态模块添加到主模块的imports中
      this.importDynamicModule(module.DynamicModule);
    });
  }

  importDynamicModule(dynamicModule: any) {
    // 添加动态模块到主模块的imports中
    this.imports.push(dynamicModule);
  }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.20.19/system.js"></script>