toJson method
Implementation
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = <String, dynamic>{};
data['userID'] = userID;
data['nickName'] = nickName;
data['nameCard'] = nameCard;
data['friendRemark'] = friendRemark;
data['faceUrl'] = faceUrl;
data["onlineDevices"] = onlineDevices ?? [];
return data;
}