Javascript 我想从Firebase获取文档数据
↑我想获取这些信息，但控制台上没有显示任何内容，尽管写入了console.logdoc.id、doc.data； console.logerror； 想Javascript 我想从Firebase获取文档数据,javascript,reactjs,react-native,google-cloud-firestore,expo,Javascript,Reactjs,React Native,Google Cloud Firestore,Expo,↑我想获取这些信息，但控制台上没有显示任何内容，尽管写入了console.logdoc.id、doc.data； console.logerror； 想 doc.id, doc.data() ↑我将console.log'abc'放在snapshot.forEachdoc=>{ abc显示在控制台上，所以我认为snapshot.forEachdoc=>{导致了一些错误。 然而，我不知道这有什么问题，所以我需要帮助来解决这个问题 换完衣服后，亲爱的巴罗斯 事实上，我不确定这是否是一个子集合。 你
doc.id, doc.data()
我以为您应该在获取快照之前调用get，而且js有async和await，我不明白您为什么要使用回调：const ref=await db.collection'users/${currentUser.uid}/memos'.orderBy'updatedAt'，'desc'.get then const docs=ref.docs.mapdoc=>doc.data；console.logdocs，但这需要包装在一个异步函数中。您介意记录快照的数据吗？它有数据还是空的？@Bargros谢谢您的帮助。我是一个业余爱好者，所以我只是按照您说的做了。我有一个解析此部分出错：const docs=ref.docs.mapdoc=>doc.data；我在谷歌上搜索了异步函数。但我还没有找到解决解析错误的方法。如果您同意，请告诉我为什么我的跳线不起作用。我将输入代码。@longuyễNánh感谢您的帮助…我将console.logsnapshot放在unsubscribe=ref.onSnapshotsnapshot=>{.snapshot的数据显示为非空！您能检查一下错误日志吗，您可能需要先在firestore上创建索引。我尝试了此操作，但无效…谢谢。
doc.id, doc.data()
snapshot.forEach((doc) => {
`useEffect(() => {
const currentUser = firebase.auth();
const db = firebase.firestore();
async function asyncCall() {
const ref = await db.collection('users/${currentUser.uid}/memos').orderBy('updatedAt', 'desc').get(),
then
const docs = ref.docs.map(doc => doc.data());
console.log(docs);
}
asyncCall();
});
return (
<Chart />
);
}`
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},
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unsubscribe = ref.onSnapshot((snapshot) => {
snapshot.forEach((doc) => {
console.log(doc.id, doc.data());
});
}, (error) => {
console.log(error);
});
unsubscribe = ref.onSnapshot((snapshot) => {
snapshot.docs.forEach((doc) => {
console.log(doc.id, doc.data());
});
}, (error) => {
console.log(error);
});