How to know if the scrollbars has appeared in browser (jQuery)?

I need to know, whet开发者_C百科her a vertical scrollbar has appeared or not in browser window. Is it possible using jQuery or any other way?

Like this:

if (document.documentElement.scrollHeight === document.documentElement.clientHeight) {
    //There is no vertical scrollbar
}

This doesn't work in IE

This is an old post but I finally got the code that also works on IE7. Hope this can help someone.

var hasScrollbar = $('body').outerHeight() > $(window).height();

Compare the document height with the window height. If it's more there's probably a scrollbar unless you disabled it.