Using QJEngine vs/as QScriptEngine

[VeNToR]

Hi;

I am porting my codes (custom type etc) from QScriptEngine to QJEngine. I have some quesitons;

1. What is corresponding QScriptable in JSEngine ? I didn't see...
2. What is corresponding QScriptContext::throwError in JSEngine ?
3. Where can I find an example about Proto Type mechanizm ?

Thanks...