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From: Cezary Tomczyk <cezary.tomczyk@gmail.com>
Newsgroups: comp.lang.javascript
Subject: Re: hasOwnProperty and property className
Date: Sat, 1 Apr 2017 15:59:14 +0200
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On 01/04/2017 12:17, Evertjan. wrote:
> Cezary Tomczyk <cezary.tomczyk@gmail.com> wrote on 01 Apr 2017 in
> comp.lang.javascript:
>
>> Just out of curiosity.
>>
>> Why document.body.hasOwnProperty('className') returns false?
>>
>> Property className does exists for object document.body object.
>
> hasOwnProperty()
> is about Javascript-objects,
> not about DOM-objects,
> methinks.
>
> var a = []; // an array
> document.write( a.hasOwnProperty('length') ); // true
> document.write( '<br>' );
>
> document.write( document.body.hasOwnProperty('style') ); // false
> document.write( '<br>' );

Thanks.

On MDN 
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty 
documentation doesn't mentioned that specifically. Just:

"The hasOwnProperty() method returns a boolean indicating whether the 
object has the specified property."

That's why I was asking.

-- 
Cezary Tomczyk
http://www.ctomczyk.pl/