关于 Angular view Query 的 id 选择器问题的单步调试

@Component({
selector: ‘example-app’,
template: `
<pane id=“1” *ngIf=“shouldShow”>
<pane id=“2” *ngIf="!shouldShow">
<button (click)="toggle()">Toggle</button>
<div id="panel 1?" #pane999>1</div>
<div id="panel 2?" pane>2</div>
<div>Selected: {{selectedPane}}</div>
`,
})
在其 Component 实现里，我期望通过 `@ViewChild`，在运行时拿到 id 为 `panel 1?` 的 div 元素的实例。
```typescript
export class ViewChildComp {
  constructor(public changeDetectorRef: ChangeDetectorRef
    ){}
  @ViewChild("panel 1?")
  set panethis(v) {
    //setTimeout(()=> this.selectedPane = v.id, 0);
    this.selectedPane = v.id;
    this.changeDetectorRef.detectChanges();
    //Promise.resolve().then(() => this.selectedPane = v.id);
  }

function executeViewQueryFn(flags, viewQueryFn, component) {
    ngDevMode && assertDefined(viewQueryFn, 'View queries function to execute must be defined.');
    setCurrentQueryIndex(0);
    viewQueryFn(flags, component);
}

@Component({
  selector: 'alert',
  template: `
    <h1 (click)="alert()">{{type}}</h1>
  `,
})
export class AlertComponent {
  @Input() type: string = "success";
  alert() {
    console.log("alert");
  }
}

@Component({
  selector: 'my-app',
  template: `
    <alert></alert>
    <alert type="danger"></alert>
    <alert type="info"></alert>
  `,
})
export class App {
  @ViewChildren(AlertComponent) alerts: QueryList<AlertComponent>
  ngAfterViewInit() {
    this.alerts.forEach(alertInstance => console.log(alertInstance));
  }
}