Question

我在当前项目中使用Firebase Firestore数据库，并且必须从前端反应添加文档，为此我需要当前时间戳。

import * as firebase from "firebase";
import React, {useState} from 'react';

const [time, setTime] = useState({''}) //here i need current timestamp from firebase.

Answer 1

那么您需要从Firebase导入Firestore，不要使用firebase.firestore.FieldValue.serverTimeStamp，它将无法正常工作

这是工作示例

import {firestore} from "firebase";

const timestamp = firestore.FieldValue.serverTimestamp();

Answer 2

firebase.initializeApp(firebaseConfig);
const projectFirestore = firebase.firestore();
const timestamp = firebase.firestore.FieldValue.serverTimestamp;

Answer 3

firebase.initializeApp（firebaseConfig）; const timestamp = firebase.firestore.FieldValue.serverTimestamp;

还请注意，尽管@shubham Takode答案是正确的，但在客户端不会填充Firebase Firestore当前时间戳，因此尝试在react useState（）管理中使用它不会有任何好处。

import * as firebase from "firebase";
import React, {useState} from 'react';

firebase.firestore
    .collection('user')
    .doc('userid1')
    .set({
           username: "first user",
           email: "user@email.com",
           time: firebase.firestore.FieldValue.serverTimestamp() // This sets a placeholder in your record that get authomatically populated with the serverTime once it gets to your firestore db.
    }).then(/*do somethings on success*/).catch(err => {/*do somethings on err*/})

如何在React的Firebase Firestore中获取/生成当前时间戳

3 个答案: