TypeScript引发错误“属性'面包屑'在类型'数据'上不存在。”

Question

我有一个Breadcrumb组件。它在编译为JavaScript时也可以正常工作，并且可以呈现所需的结果，但IDE会抛出一个我无法纠正的错误。它说如下： -

[ts] Property 'breadcrumb' does not exist on type 'Data'. 

我的面包屑的代码如下： -

import { Component } from '@angular/core'; 
import { Router, ActivatedRoute, NavigationEnd } from '@angular/router'; 
import 'rxjs/add/operator/filter'; 

import { BreadcrumbModel } from './breadcrumb.model'; 

@Component({ 
    selector: 'breadcrumb', 
    template: ` 
    <ol class="breadcrumb"> 
    <li *ngFor="let breadcrumb of breadcrumbs; let last = last"> 
     <a [routerLink]="breadcrumb.url">{{breadcrumb.label}}</a> 
    </li> 
    </ol>` 
}) 
export class BreadcrumbComponent { 
    breadcrumbs: Array<BreadcrumbModel>; 
    constructor(private router: Router, private route: ActivatedRoute) { } 
    ngOnInit() { 
    this.router.events 
     .filter(event => event instanceof NavigationEnd) 
     .subscribe(event => { // note, we don't use event 
     this.breadcrumbs = []; 
     let currentRoute = this.route.root, 
      url = ''; 
     do { 
      let childrenRoutes = currentRoute.children; 
      currentRoute = null; 
      childrenRoutes.forEach(route => { 
      if (route.outlet === 'primary') { 
       let routeSnapshot = route.snapshot; 
       url += '/' + routeSnapshot.url.map(segment => segment.path).join('/'); 
       this.breadcrumbs.push({ 
       label: route.snapshot.data.breadcrumb, 
       url: url 
       }); 
       currentRoute = route; 
      } 
      }) 
     } while (currentRoute); 
     }) 
    } 
} 

面包屑模型的代码如下： -

export class BreadcrumbModel{ 
    label:string; 
    url:string; 
} 

错误我进入浏览器如下： -

[at-loader] src\app\shared\core\breadcrumb\breadcrumb.component.ts:34:44 
    Property 'breadcrumb' does not exist on type '{ [name: string]: any; }'. 
errors @ client?cd17:80 
sock.onmessage @ socket.js?e5d0:37 
EventTarget.dispatchEvent @ eventtarget.js?3e89:51 
(anonymous) @ main.js?45b8:274 
SockJS._transportMessage @ main.js?45b8:272 
EventEmitter.emit @ emitter.js?927b:50 
WebSocketTransport.ws.onmessage @ websocket.js?c17e:35 
wrapFn @ zone.js?fad3:1039 
ZoneDelegate.invokeTask @ zone.js?fad3:275 
Zone.runTask @ zone.js?fad3:151 
ZoneTask.invoke @ zone.js?fad3:345 

我不想将目标从ES5更改为ES6。这似乎不是可行的解决方案。 IDE屏幕截图如下： -

请帮忙解决问题。出现此错误后，TSLint不会在浏览器上发出任何警告。

Answer 1

在angular您必须使用[name]表示法来获取该值。很显然，没有“必须”，因为它仍然可以正常工作，但要获得打字稿编译器停止抱怨使用：

route.snapshot.data['breadcrumb']; 

阅读Custom Preloading Strategy和向下滚动到app/selective-preloading-strategy.ts样本文件