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Javascript version 1.8

Is it possible to identify what version the javascript is being programmed by looking at the web page source code?  I would think that knowing of a certain construct used in version 1.8 and that construct being used on that web page, that one could determine what version was being used.
Is there an easier way?

How much information can be gather from a statement like this;
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

I see that the DTD is xhtml, but is there more?
5 Solutions
Manuel Marienne-DuchĂȘneITMCommented:
may be you want to talk Jquery a librairy for javascript :

Dave BaldwinFixer of ProblemsCommented:
You can see the version of the jQuery library in the source code of a page.  But javascript itself is part of the browser and is not generally available separately and neither is the version of it.  Current versions of javascript in browsers are based on ECMAscript.  More info here: https://en.wikipedia.org/wiki/ECMAScript
Julian HansenCommented:
I am assuming you mean JQuery not Javascript

You can check the version like so
var ver = $().jquery;
alert (ver);

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Robert SchuttSoftware EngineerCommented:
Assuming you do mean javascript, seems the way to do it is to include the version in the script tag so it's clear for people (and browsers), as shown here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/New_in_JavaScript/1.8 

I'm not sure what is supposed to happen when a browser doesn't support the new version, probably ignore the entire script block.
Are you looking for navigator properties? See http://www.w3schools.com/js/tryit.asp?filename=try_nav_all
Julian HansenCommented:
Having re-read your question
s it possible to identify what version the javascript is being programmed by looking at the web page source code?
Are you asking what version the author decided to use or what version is supported by the browser?
From the rest of your question it seems you are trying to work out something about the page and how it was developed.

Maybe tell us what it is you are trying to do - why you need this information - and we might be better able to help you.

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