QTimer in QJSengine

[UremSept]

hi,I want to add Qtimer to QJSengine, but something went wrong. I tried to create an object myself, it is possible to use the following method, but Qtimer does not work.
jstimer.h

#include <QObject>
#include <QTimer>
#include <QJSEngine>
class JsTimer : public QObject
{
    Q_OBJECT
public:
    explicit JsTimer(QJSEngine* engine);
    ~JsTimer();
    void static registerToEngine(QJSEngine* jsengine);

    Q_INVOKABLE QJSValue createInstance();
private:
    QJSEngine* m_engine;
};

jstimer.cpp

#include "jstimer.h"
#include <QDebug>
JsTimer::JsTimer(QJSEngine *engine):QObject(engine)
{
    qDebug()<<"create jstimer!";
}

JsTimer::~JsTimer()
{
    qDebug()<<"delete jstimer!";
}

void JsTimer::registerToEngine(QJSEngine *jsengine)
{
    if(jsengine==nullptr){
        return;
    }
    QJSValue factoryObj = jsengine->newQObject(new JsTimer(jsengine));
    jsengine->globalObject().setProperty("_timer", factoryObj);
}

QJSValue JsTimer::createInstance()
{
    qDebug()<<"createInstance";
    return m_engine->newQObject(new QTimer());
}

main.cpp

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QString fileName = ":/test.jst";
    QFile scriptFile(fileName);
    if (!scriptFile.open(QIODevice::ReadOnly)){
        qDebug()<<"open file fail!";
    }
    QTextStream stream(&scriptFile);
    QString contents = stream.readAll();
    scriptFile.close();
    QJSEngine myEngine;
    myEngine.installExtensions(QJSEngine::AllExtensions);
    JsTimer::registerToEngine(&myEngine);
    QJSValue result = myEngine.evaluate(contents, fileName);
    if (result.isError())
        qDebug()
                << "Uncaught exception at line:"
                << result.property("lineNumber").toInt()
                << endl << result.toString();
    qDebug()<<"end";
    return a.exec();
}

test.jst

print(_timer);
var timer = _timer.createInstance();
print("--------------");
timer.timeout.connect(this,function(){
    print("timer out!");
});
timer.start(1000);

Console printing

create jstimer!
js: JsTimer(0x1c6bcd38)
createInstance

error

Error - RtlWerpReportException failed with status code :-1073741823. Will try to launch the process directly