我在一個聊天應用程式中作業。我想將訊息存盤在這樣的物件中：
{
'room1': ['msg1', 'msg2', ...]
'room2': ['msg3', 'msg4', ...]
...
}
我在我的 socket.io 服務器中定義了一個變數，roomMessages
問題是當我想在特定房間中添加一條訊息時使用roomMessages[room].push(data);它向我顯示此錯誤：TypeError: Cannot read properties of undefined (reading 'push')
這是我的 socket.io 代碼：
const roomMessages = {};
roomsNamespace.use((socket, next) => {
const token = socket.handshake.query.token;
console.log(token);
if (!token) return next(new Error("not auth"));
next();
});
roomsNamespace.on("connection", (socket) => {
const token = socket.handshake.query.token;
const apiService = new ApiService(process.env.BE_URL, token);
const room = socket.handshake.query.room;
socket.on("join-room", async () => {
socket.join(room);
await apiService.joinRoom(room);
const usersInThisRoom = await apiService.getUsersInRoom(room);
roomsNamespace.in(room).emit("all-users", usersInThisRoom);
socket.emit("room-messages", roomMessages[room]);
});
socket.on("chat-message", (data) => {
// console.log(data);
if (roomMessages[room]) roomMessages[room].push(data);
roomsNamespace.in(room).emit("chat-message", data);
});
基本上，我想在用戶加入聊天時發送以前的訊息如何解決這個錯誤？
uj5u.com熱心網友回復：
你可以做這樣的事情
const roomMessages = {};
const getMessages = (room) => roomMessages[room] || []
const addMessage = (room, message) => {
roomMessages[room] = [...getMessages(room), message]
}
roomsNamespace.use((socket, next) => {
const token = socket.handshake.query.token;
console.log(token);
if (!token) return next(new Error("not auth"));
next();
});
roomsNamespace.on("connection", (socket) => {
const token = socket.handshake.query.token;
const apiService = new ApiService(process.env.BE_URL, token);
const room = socket.handshake.query.room;
socket.on("join-room", async () => {
socket.join(room);
await apiService.joinRoom(room);
const usersInThisRoom = await apiService.getUsersInRoom(room);
roomsNamespace.in(room).emit("all-users", usersInThisRoom);
socket.emit("room-messages", getMessages(room));
});
socket.on("chat-message", (data) => {
// console.log(data);
addMessage(room, data)
roomsNamespace.in(room).emit("chat-message", data);
});
這樣，如果您以后需要，您可以更改messageRepository在 redis 或任何您想要的地方存盤資料的實作
轉載請註明出處，本文鏈接：https://www.uj5u.com/ruanti/471930.html
標籤：javascript 节点.js 插座 网络套接字