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
