Close Modal when click outside

I am trying to use javascript to get my modal to close when you click outside but it doesn't seem to be working, can anybody help?

var clickHandler = function () {
    if (!f.target) f.target = f.srcElement;
    if (f.target.tagName == "DIV") {
        if (f.target.id != "window") closeModal(f);
}

Tried the above but no luck, any clues?

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