在QJsEngine中注册Qt中的自定义类型

// MyCustomType.h
#include <QObject>

class MyCustomType : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int value READ getValue WRITE setValue NOTIFY valueChanged)

public:
    explicit MyCustomType(QObject *parent = nullptr);

    int getValue() const;
    void setValue(int value);

    Q_INVOKABLE void doSomething();

signals:
    void valueChanged();

private:
    int m_value;
};

// MyCustomType.cpp
#include "MyCustomType.h"

MyCustomType::MyCustomType(QObject *parent)
    : QObject(parent), m_value(0)
{
}

int MyCustomType::getValue() const
{
    return m_value;
}

void MyCustomType::setValue(int value)
{
    if (m_value != value) {
        m_value = value;
        emit valueChanged();
    }
}

void MyCustomType::doSomething()
{
    // do something
}

// main.cpp
#include <QCoreApplication>
#include <QJSEngine>
#include <QtQml>

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    QJSEngine engine;
    qmlRegisterType<MyCustomType>("Custom", 1, 0, "MyCustomType");

    // 使用自定义类型
    QJSValue result = engine.evaluate("var obj = new Custom.MyCustomType(); obj.value = 42; obj.doSomething();");
    if (result.isError()) {
        qDebug() << result.toString();
    }

    return app.exec();
}