📅  最后修改于: 2022-03-11 14:48:27.931000             🧑  作者: Mango
this.announcementCollectionRef = afs.collection('announcements', ref => ref.orderBy('createdAt', 'desc'));
this.announcements = this.announcementCollectionRef.snapshotChanges().map(actions => {
return actions.map(a => {
const data = a.payload.doc.data() as AnnouncementId;
const id = a.payload.doc.id;
return { id, ...data };
});
});