On Wed, Nov 16, 2011 at 7:37 AM, Rahul <[email protected]> wrote:
> (function(){
>
> var personProto = {
> describe : function(){
> alert("NAME IS "+this.name);
> }
> };
>
> var jane = {
> name : "JANE",
> __proto__ : personProto
> };
>
> var tarzan = {
> name : "TARZAN",
> __proto__ : personProto
> };
>
> jane.describe();
>
>
> })();
>
> in the above code for the last line i am getting an error "Object
> doesn't support this property or method",
In which browser?
IE doesn't support the non-standard __proto__ property.
> But what i am expecting is object "jane" must inherit method describe
> from object "personProto"
In ES5 browsers use:
var tarzan = Object.create(personProto);
tarzan.name = "TARZAN";
or
var tarzan = Object.create(personProto, {name:{value:"TARZAN",
writable:true, configurable:true,enumerable:true}});
In older browsers you can make your own equivalent to Object.create:
function clone(o) {
function_(){};
_.protototype = o;
return new _;
}
var tarzan = clone(personProto);
tarzan.name = "TARZAN";
Or, just do it the old-fashioned way:
function mkTarzan() { this.name = "TARZAN"; }
mkTarzan.prototype = personProto;
var tarzan = new mkTarzan();
What is the problem you are trying to solve that don't work with
normal constructor functions?
/L
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