Snook has a pretty good explanation:
http://snook.ca/archives/javascript/javascript_pass/
Best,
Tobie
On Jan 17, 5:54 pm, iporter <[EMAIL PROTECTED]> wrote:
> Ok, I've figured out that I can use this.options={} within the
> initialize function to declare defaults, and then follow this with
> 'Object.extend(this.options, options || {});' to customise these
> defaults
>
> But I still don't understand why I get different behaviour in the
> above example for this.options.value and this.value - can you tell me
> why?
>
> Thanks
>
> On Jan 17, 4:30 pm, iporter <[EMAIL PROTECTED]> wrote:> In the below code, I
> expect two alerts '1 : 1' and then '1 : 1', but
> > in reality I get '1 : 1' and '2 : 1'. For some reason, the
> > declaration of the second object of class myClass alters the first
> > object of the same class. However, it only alters
> > 'this.options.value', and not 'this.value'. Can you tell me why this
> > behaviour occurs, and how to resolve it?
>
> > Cheers
>
> > ---------------------------------------------------------------------------
> > var myClass = Class.create({
> > options:{},
> > value: false,
> > initialize: function(options) {
> > this.options.value = options.value;
> > this.value = options.value;
> > },
> > myAlert:function() {
> > alert(this.options.value + ' : ' + this.value);
> > }
>
> > });
>
> > var classObj1 = new myClass({value:1});
> > classObj1.myAlert();
> > var classObj2 = new myClass({value:2});
> > classObj1.myAlert();
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