What is Virtual DOM?

Question

Recently, I looked at Facebook\'s React framework. It uses a concept called \"the Virtual DOM,\" which I didn\'t really understand.

What is the Virtual DOM? What are

Answer 1

let's make order and sense in this matter. React (or any other library) are a "layer" on javascript.

There is no such thing as virtual dom, there is unattached dom .

let me explain in simple javascript :

 let vDom = {};     // this is a object that will be used to hold the elements

 let d = document.createElement('div');
 d.innerHTML = 'hi, i am a new div';

 vDom['newDiv'] = d;

at this point we have created a Div which is not shown on the dom , because it has not attached

but we can access it, add attributes, values, change etc..

once we call : (for ex,add it to body)

    document.body.appendChild(vDom['newDiv'])

then we will see it;

 for one how saw javascript libs come and go , i suggest to any one 
 to do one simple thing : master JAVAscript, not layers :)