小编Fil*_*tic的帖子

我正在学习 javafx 并且我已经完成了基础知识，所以现在我想做一个更复杂的项目。我在网上阅读了很多关于这个主题的指南，但是当每个类代表 1 个场景时，我找不到任何地方如何切换场景或更改根节点。
为了更好地理解这里是我项目的简化版本：
假设我有 3 个类 A、B 和 C：

public class A{
    private Stage stage;
    A(Stage stage){
         this.stage = stage;
    }
    public void showGui(){
        // This will make all elements, put them on scene and then set that scene to stage
    }
    public void callB(){
        B b = new B(Stage);
        b.showGui();
    }
} 
public class B{
    private Stage stage;
    B(Stage stage){
         this.stage = stage;
    }
    public void showGui(){
        // This will make all elements, put them on …

我在项目上工作,我发现奇怪的问题,jwt.sign函数不识别传递用户作为对象,但是当我在jwt.sign中创建新对象时,它工作正常.

如果从文本中难以理解的是代码:

var username = req.body.username;
var password = req.body.password;

User.getUserByUsername(username,(err, user)=>{
    if(err) 
        throw err;
    if(!user) 
        return res.json({success: false, msg: "User with username "+ username+" doesn't exist"});

    User.comparePassword(password, user.password, (err, passwordsMatched) =>{
        // Prints that user is type of object
        console.log("Type of user: "+typeof(user));
        if(err) throw err;

        if(passwordsMatched){
            // line bellow throws error that it expects object when I pass user
            var token = jwt.sign(user, Config.secret, {expiresIn: 604800});
            res.json({
                success: true, 
                token: 'JWT '+token, 
                user: {
                    name : user.name, 
                    username: …