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我有一个脚本聊天，它工作正常，但如果成员通过 Android 进入并离开聊天并打开任何其他程序，服务器将删除它 这是我的服务器 js commond

//DisconnectUser
    io.use((socket, next) => { next(); }).on('connection', socket => { console.log('(default) client connected'); });
    socket.on("disconnect", function () {
        var userData = UserInfo[socket.id];
        if (typeof userData !== "undefined") {
            if (UserInfo[socket.id].powers["stealth"] == 1000 && UserInfo[socket.id].stealth == true) {
            } else {
                io.to(userData.idroom).emit("msg", {
                    cmd: "msg",
                    data: {
                        bg: "none",
                        class: "hmsg",
                        topic: userData.username,
                        msg: "( هذا المستخدم غادر الدردشة)",
                        roomid: userData.idroom,
                        pic: userData.pic,
                    },
                });
            }
            if (UserInfo[socket.id].uid) {
                var UpdateUser = {
                    $set: {
                        lastssen: new Date().getTime(),
                        token: stringGen(177),
                    },
                };

                user_list.updateOne({ id: UserInfo[socket.id].uid }, UpdateUser, function (err, uruser) {
                    if (err) throw err;
                    if (uruser) {
                    }
                });
            }
            io.emit("msg", { cmd: "ur", data: [userData.id, null] });
            socket.leave(userData.idroom);
        }
        delete UserInfo[socket.id];

        const indexw = online.findIndex((x) => x.id == socket.id);
        if (indexw != -1) {
            online.splice(
                online.findIndex((v) => v.id == socket.id),
                1
            );
            io.emit("msg", { cmd: "u-", data: socket.id });
        }

        var index = UserEntre.findIndex((x) => x == socket.id);
        if (index != -1) {
            UserEntre.splice(UserEntre.indexOf(socket.id), 1);
        }

        lastssen: new Date().getTime();
    });

**我该怎么做才能让用户在聊天中保持最长时间？**

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