如何清除Angular中的Observable <Array[]>？

Question

我想清除一個可觀察對象數組。我所做的：

private pages: Observable<CustomPage[]>; 
//clear 
this.pages.map(p => p = []); 

有沒有直接可觀察法（rxjs）這樣做沒有映射？

Answer 1

如果你來自英雄之旅教程，你的理解可能會受到他們在那裏展示的基本服務的限制。這裏是一個更全面充實的服務，你想要做什麼的速寫......

export class PageService { 

    private _pages = new ReplaySubject<CustomPage[]>(1); 

    private _dateFilter = new ReplaySubject<DateFilterCriteria>(1); 

    //Subscribe to this in your component 
    get pages(): Observable<CustomPage[]> { 
    return this._pages; 
    } 

    //Use this if you want to display the currently selected date 
    //filter somewhere (e.g. on your date filter control) 
    get dateFilter(): Observable<DateFilterCriteria> { 
    return this._dateFilter; 
    } 

    //PageAccess encapsulates requests against the Http service 
    constructor(private pageAccess: PageAccess) { 
    this._dateFilter.subscribe(dateFilter => this.fetchPages(dateFilter)); 
    this.setNewDateFilter(null); 
    } 

    //Clears out the current list of pages, issues a new request 
    //for pages 
    private fetchPages(dateFilter: DateFilter) { 
    this._pages.next([]); 
    this.pageAccess.fetchPages(dateFilter).subscribe(pages => { 
     this._pages.next(pages); 
    }); 
    } 

    //When your date filter control changes it should call this 
    //method 
    setNewDateFilter(dateFilter: DateFilter) { 
    this._dateFilter.next(dateFilter); 
    } 

} 

另外，我覺得我用DateFilter和DateFilterCriteria互換代表的一些類，您使用指示的網頁是什麼日期你要。