Detect if a page has a vertical scrollbar?

Question

I just want some simple JQ/JS to check if the current page/window (not a particular element) has a vertical scrollbar.

Googling gives me stuff that seems overly comp

Answer 1

This one did works for me:

function hasVerticalScroll(node){
    if(node == undefined){
        if(window.innerHeight){
            return document.body.offsetHeight> window.innerHeight;
        }
        else {
            return  document.documentElement.scrollHeight > 
                document.documentElement.offsetHeight ||
                document.body.scrollHeight>document.body.offsetHeight;
        }
    }
    else {
        return node.scrollHeight> node.offsetHeight;
    }
}

For the body, just use hasVerticalScroll().