小编pet*_*_mm的帖子

我正在尝试对我的页面进行分页.

网址:https://pettemm.github.io/angular/home

Url代码:https://github.com/pettemm/angular

这是抓取我的物品的服务:

import { Injectable } from '@angular/core';
import { AngularFirestore, AngularFirestoreCollection, 
AngularFirestoreDocument } from 'angularfire2/firestore';
import { Observable } from 'rxjs/Observable';
import { Item } from '../models/item';


    @Injectable()
    export class ItemService {

    itemsCollection: AngularFirestoreCollection<Item>;
    items: Observable<Item[]>;
    itemDoc: AngularFirestoreDocument<Item>;

    constructor(public afs: AngularFirestore) { 

    this.itemsCollection = this.afs.collection('items', ref => 
    ref.orderBy('title','desc'));

this.items = this.itemsCollection.snapshotChanges().map(changes => {
return changes.map(a =>{
  const data = a.payload.doc.data() as Item;
  data.id = a.payload.doc.id;
  return data;
  });
});
}

getItems(){ …