javascript - height of page on scrolling -

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How do I get the height of the page on the scroll?

Is it possible to determine how many users have scrolled the page and it determines the length of the cover.

I have tried: 

  var scroll = $ wnd.scrollTop   
 
 
  javascript  But this is not giving results?  
 Am I doing this wrong?   
 
 
 Try using it.  
  Public Fixed Country int getScrollTop () / * - {return $ wnd.pageYOffset; } - * /;   
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