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 QScriptEngine myEngine;
 QScriptValue three = myEngine.evaluate("1 + 2");

class myProxy(.... ) 
: QObject(..... )
{
Q_OBJECT
...
public:
...
 callF(int x) {emit calculate(x);};
 
signals:
 void calculate(int x);
...
public slots:
 void result(int x, int y)
}

QScriptEngine myEngine;
myProxy myObject;
myEngine.globalObject().setProperty("myObj", myEngine.newQObject(&myObject));
QString myScript = " function myCalculate(x) { myObj.result(x, x*2); return 0; }; myObj.calculate.connect(myCalculate);"
myEngine.evaluate(myScript);

QScriptEngine engine;
 engine.evaluate("function cube(x) { return x * x * x; }");

 QScriptValue global = engine.globalObject();

 QScriptValue cube = global.property("cube");
 QScriptValueList args;
 args << 3;

 qDebug() << cube.call(QScriptValue(), args).toNumber(); // 27

QScriptEngine engine;
QScriptValue global = engine.globalObject();
QScriptValue sin = global.property("Math").property("sin");
global.addProperty("sin", sin);

QScriptEngine engine;
engine.evaluate("sin = Math.sin");