我有一個(gè)角度頁(yè)面，它使用來(lái)自服務(wù)的可觀察參數(shù)。但是，當(dāng)此可觀察更新時(shí)，頁(yè)面不會(huì)更新以匹配。我嘗試過(guò)將可觀察的結(jié)果存儲(chǔ)在平面值中，或者更改布爾值以調(diào)整UI，但似乎沒(méi)有效果。記錄可觀察對(duì)象可確認(rèn)它已正確更新，并在重新導(dǎo)航到該頁(yè)面時(shí)顯示新值。其他條件 UI 更新可以正確修改頁(yè)面，只有下面的一個(gè) （） 導(dǎo)致此問(wèn)題。*ngIf="(entries$ | async), else loading"component.tsexport class EncyclopediaHomeComponent implements OnInit {  entries$: Observable<EncyclopediaEntry[]>;  categories$: Observable<string[]>;  entry$: Observable<EncyclopediaEntry>;  entry: EncyclopediaEntry;  isEditing: boolean;  constructor(private route: ActivatedRoute, private encyService: EncyclopediaService) {    this.entries$ = encyService.entries$;    this.categories$ = encyService.categories$;    this.entries$.subscribe(es => {      console.log(es);    });    route.url.subscribe(url => this.isEditing = url.some(x => x.path == 'edit'));    this.entry$ = route.params.pipe(      switchMap(pars => pars.id ? encyService.getEntry(pars.id) : of(null)),    );    this.entry$.subscribe(entry => this.entry = entry);  }  ngOnInit(): void {  }  updateEntry(entry: EncyclopediaEntry) {    this.encyService.updateEntry(entry.id, entry);  }}組件.html<div class="encyclopedia-container">    <ng-container *ngIf="(entries$ | async), else loading">        <app-enc-list [entries]="entries$ | async"            [selectedId]="entry ? entry.id : null"></app-enc-list>        <ng-container *ngIf="entry">            <app-enc-info *ngIf="!isEditing, else editTemplate"                [entry]="entry$ | async"></app-enc-info>            <ng-template #editTemplate>                <app-enc-edit [entry]="entry$ | async" [categories]="categories$ | async"                    (save)="updateEntry($event)"></app-enc-edit>            </ng-template>        </ng-container>    </ng-container>    <ng-template #loading>        <mat-progress-bar mode="indeterminate"></mat-progress-bar>        <br>        <p>Loading Encyclopedia...</p>    </ng-template></div>