javascript - Navigation with different background color when is on top -


i working on little project , have navigation transparent background. need if start scrolling, background change on black.

my code: 

window.onscroll = function f() {     if (document.documentelement.scrolltop + document.body.scrolltop > prvni.parentnode.offsettop        ) {         nav.style.display = "none";     }     else {         nav.style.display = "block";     } }


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