详解利用Angular实现多团队模块化SPA开发框架

externals: [{
 'rxjs': 'Rx',
 '@angular/common': 'ng.common',
 '@angular/compiler': 'ng.compiler',
 '@angular/core': 'ng.core',
 '@angular/http': 'ng.http',
 '@angular/platform-browser': 'ng.platformBrowser',
 '@angular/platform-browser-dynamic': 'ng.platformBrowserDynamic',
 '@angular/router': 'ng.router',
 '@angular/forms': 'ng.forms',
 '@angular/animations': 'ng.animations'
}

const loadModule = (moduleName) => {
 return () => {
  return ModuleLoaderService.load(moduleName);
 };
};

const dynamicRoutes = [];

modules.forEach(item => {
 dynamicRoutes.push({
  path: item.path,
  canActivate: [AuthGuard],
  canActivateChild: [AuthGuard],
  loadChildren: loadModule(item.module)
 });
});
const appRoutes: Routes = [{
 path: 'login', component: LoginComponent
}, {
 path: 'logout', component: LogoutComponent
}, {
 path: '', component: LayoutComponent, canActivate: [AuthGuard],
 children: [
  { path: '', component: HomeComponent },
  ...dynamicRoutes,
  { path: '**', component: NotFoundComponent },
 ]
}];

load(moduleName, isDepModule = false): Promise<any> {
 let module = window['xxx'][moduleName];
 if (module) {
  return Promise.resolve(module);
 }
 return new Promise((resolve, reject) => {
  let path = `${root}${moduleName}/app.js?rnd=${Math.random()}`;
  this._loadCss(moduleName);
  this.http.get(path)
   .toPromise()
   .then(res => {
    let code = res.text();
    this._DomEval(code);
    return window['xxx'][moduleName];
   })
   .then(mod => {
    window['xxx'][moduleName] = mod;
    let AppModule = mod.AppModule;
    // route change will call useModuleStyles function.
    // this.useModuleStyles(moduleName, isDepModule);
    resolve(AppModule);
   })
   .catch(err => {
    console.error('Load module failed: ', err);
    resolve(EmptyModule);
   });
 });
}

// 取自jQuery
_DomEval(code, doc?) {
 doc = doc || document;
 let script = doc.createElement('script');
 script.text = code;
 doc.head.appendChild(script).parentNode.removeChild(script);
}

_loadCss(moduleName: string): void {
 let cssPath = `${root}${moduleName}/app.css?rnd=${Math.random()}`;
 let link = document.createElement('link');
 link.setAttribute('rel', 'stylesheet');
 link.setAttribute('href', cssPath);
 link.setAttribute('class', `xxx-module-style ${moduleName}`);
 document.querySelector('head').appendChild(link);
}

useModuleStyles(moduleName: string): void {
 let xxxModuleStyles = [].slice.apply(document.querySelectorAll('.xxx-module-style'));
 let moduleDeps = this._getModuleAndDeps(moduleName);
 moduleDeps.push(moduleName);
 xxxModuleStyles.forEach(link => {
  let disabled = true;
  for (let i = moduleDeps.length - 1; i >= 0; i--) {
   if (link.className.indexOf(moduleDeps[i]) >= 0) {
    disabled = false;
    moduleDeps.splice(i, 1);
    break;
   }
  }
  link.disabled = disabled;
 });
}

@ViewChild('dynamicComponentContainer', { read: ViewContainerRef }) dynamicComponentContainer: ViewContainerRef;

constructor(
 private elementRef: ElementRef,
 private renderer: Renderer2,
 private tabset: TabsetComponent,
 private resolver: ComponentFactoryResolver,
 private parentContexts: ChildrenOutletContexts
) {
}

public destroy() {
 let el = this.elementRef.nativeElement as HTMLElement;
 // tslint:disable-next-line:no-unused-expression
 el.parentNode && (el.parentNode.removeChild(el));
}

private loadComponent(component: any) {
 let context = this.parentContexts.getContext(PRIMARY_OUTLET);
 let injector = ReflectiveInjector.fromResolvedProviders([], this.dynamicComponentContainer.injector);
 const resolver = context.resolver || this.resolver;
 let factory = resolver.resolveComponentFactory(component);
 //  let componentIns = factory.create(injector);
 //  this.dynamicComponentContainer.insert(componentIns.hostView);
 this.dynamicComponentContainer.createComponent(factory);
}

this.router.events.subscribe(evt => {
 if (evt instanceof NavigationEnd) {
  let pageComponent;
  let pageName;
  try {
   let nextRoute = this.route.children[0].children[0];
   pageName = this.location.path();
   pageComponent = nextRoute.component;
  } catch (e) {
   pageName = '$$notfound';
   pageComponent = NotFoundComponent;
  }
  let idx = this.pageList.length + 1;
  if (!this.pageList.find(x => x.name === pageName)) {
   this.pageList.push({
    header: `页面${idx}`,
    comp: pageComponent,
    name: pageName,
    closable: true
   });
  }
  setTimeout(() => {
   this.selectedPage = pageName;
  });
 }
});