css - How to change transparency of background image using javascript? -

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I have a repeat opaque background for an element, I should be able to change the ambiguity for the background image using Javascript. I want to adjust image opacity based on the scroll position.

I found this link to do so after using the "CSS" after the pseudo class:

But it seems that I do not change the properties for pseudo classes using espionage Can anyone know how I can get it?

Try something like this:
HTML: 

  & Lt; Div id = "img" & gt; & Lt; / Div & gt;

CSS: 

  #img {background: url (enter your image file url here); Width: 100%; Height: 100%;}

javascript: 

  document.getElementById ("img"). Style.opacity = 0.5;

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