Update Javascript Variable if WordPress Admin Bar is enabled

wpadminbar.js

jQuery(document).ready(function ($) {

	// The long version
	var scrollOffset;
	if ($('body').hasClass('admin-bar')) {
		scrollOffset = 64;
	} else {
		scrollOffset = 32;
	}

	// The slightly shorter version
	var scrollOffset;
	if ($('body').hasClass('admin-bar'))
		scrollOffset = 64;
	else
		scrollOffset = 32;

	// The shorthand
	var scrollOffset = $('body').hasClass('admin-bar') ? 64 : 32;

});