I think this is discussed here:
http://kb.mozillazine.org/Differential_inheritance
--- Aaron Boodman <[EMAIL PROTECTED]> wrote:
> Only constructor functions can have .prototype. The value of
> .prototype flows through instances of that constructor as private
> internal data of the JSObject which JavaScript code cannot (usually)
> access.
>
> So the canonical way to do multi-level inheritance is:
>
> function A() {}
>
> A.prototype = new B();
>
> function B() {}
>
> B.prototype = {}; // or new C...
>
>
> One reason this sucks is that it creates an instance of B when that
> isn't what you really meant.
>
> Luckily, Mozilla has a cool syntax you can use to circumvent this
> problem:
>
> function A() {}
> A.prototype.foo = function(){}
>
> function B(){}
> B.prototype = {};
> B.prototype.__proto__ = A.prototype;
> B.prototype.bar = function(){}
>
> var b = new B();
> b.foo();
> b.bar();
>
> You can encapsulate this a bit with:
>
> function clone(parent) {
> var obj = {};
> obj.__proto__ = parent;
> return obj;
> }
>
> function B(){}
> B.prototype = extend(A.prototype);
> B.prototype.bar = function(){}
>
> - a
>
> On 12/6/05, Adam Judson <[EMAIL PROTECTED]> wrote:
> > I thought I understood this...
> >
> > I have
> >
> > function A() = ...
> >
> > A.prototype = {...}
> >
> > and now I want to add
> >
> > A.prototype.prototype = new SuperClass();
> >
> > which doesn't do what I want.
> >
> > Is there a way to do this?
> >
> > Adam
> > _______________________________________________
> > Project_owners mailing list
> > [email protected]
> > http://mozdev.org/mailman/listinfo/project_owners
> >
> _______________________________________________
> Project_owners mailing list
> [email protected]
> http://mozdev.org/mailman/listinfo/project_owners
>
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