Identifying HTML documents in my object - javascript

Question

In an effort to roll off my own object copier for javascript, I want to be able to identify what types each property has. This is my code:

function HandlerFunction(){
}

function item(){
    this.any=1;
    this.doc=document.createElement('DIV');
    this.onclick=new Function('HandlerFunction()');
}

var o={};
o=new item();
o.any.??? = a number indicating 'any' is a custom object name
o.doc.??? = a number indicating doc is an html object name
o.onclick.??? = a number indicating onclick is an even handler name

Is there a function I can use that can replace the question marks that allows me to separate the event handlers, the html elements and custom object names apart from each other so that I don't end up doing recursive copying when iterating through the properties in my future copy function?

Answer 1

You can use instanceof for objects and typeof for primitives

o.doc instanceof HTMLElement // true
typeof o.any == "number" // true
o.onclick instanceof Function // true
typeof o.onclick == "function" // true, function also works with typeof

See Which is best to use: typeof or instanceof?