https://learn.microsoft.com/en-us/dotnet/api/microsoft.jscript.activationobject.getfield?view=netframework-4.8.1
ActivationObject.GetField(String, Int32) Method (Microsoft.JScript) | Microsoft Learn
Returns a field that has the specified name by searching the scope hierarchy. This method searches only the scope that is specified by the lexical level.
getfieldstringmethodmicrosoftjscript