The reason there is a difference between 'this' and 'holder' is prototype chain lookup. If you call a function on an object and the function isn't found in the object itself, V8 consults the prototype chain of the object. The 'holder' is the object where the function was found during lookup -- and 'this' is the object where the lookup was initiated.
Cheers, Kasper On Mon, Sep 8, 2008 at 7:29 AM, CGamesPlay <[EMAIL PROTECTED]> wrote: > > What is a function call's Holder()? When is it different from This()? > > Based on experimental evidence, it looks like the Holder() is always > This() in a method call, but in an accessor, Holder() is the global > object. The only thing I can tell form the source code is that > Holder() comes from the V8 internals and This() is the last thing put > on the stack before the call. > > More importantly, I found that when using an accessor, you have to use > info.This(), *not* info.Holder(), like the Embedder's Guide would have > you believe. I just want to know what the technical meanings are. > > > --~--~---------~--~----~------------~-------~--~----~ v8-users mailing list [email protected] http://groups.google.com/group/v8-users -~----------~----~----~----~------~----~------~--~---
