我在react.js中编写这段代码
function Sidebar() {
const [rooms, setRooms] = useState( [] );
useEffect(() => {
db.collection("rooms").onSnapshot((snapshot)
=>
setRooms(
snapshot.docs.map((doc) => ({
id: doc.id,
data: doc.data(),
})
))
);
}, []);
它显示错误:
./ src / Sidebar.js 17:9行:解析错误:意外的令牌,预期为“,”
15 | useEffect(() => {
16 | db.collection("rooms").onSnapshot((snapshot)
> 17 | =>
| ^
18 | setRooms(
19 | snapshot.docs.map((doc) => ({
20 | id: doc.id,