Firebase:创建文档时存储服务器时间戳 [英] Firebase: Store server timestamp when document created

问题描述

当我使用此代码时:

firestore().collection("item").add({...item, created: firebase.database.ServerValue.TIMESTAMP})

它创建条目{".sv" : "timestamp"}<-实际单词时间戳"

It creates entry {".sv" : "timestamp"} <-- actual word "timestamp"

推荐答案

您似乎正在Firestore中创建文档，但尝试从Realtime数据库(这是另一种Firebase产品)中获取时间戳.

It looks like you're creating a document in Firestore, but trying to get a timestamp from the Realtime Database, which is a different Firebase Product.

您可以通过以下方式使用Firestore的时间戳:firebase.firestore.FieldValue.serverTimestamp()这样:

firestore().collection("item")
 .add({...item, created: firebase.firestore.FieldValue.serverTimestamp()})

2019年2月更新:原始答案已被弃用. Firestore时间戳的新用法是:

Update Feb 2019: The original answer has been deprecated. The new use of Firestore's timestamp is:

firestore().collection("item")
 .add({...item, created: firebase.firestore.Timestamp.fromDate(new Date()) })

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