JQuery航点帮助

Question

我已经离开网页设计很长一段时间了，有人向我寻求帮助来重现这种效果：http://www.jetsetter.com/destinations/italy?nm=destinations

在别人的帮助下，我离这里很近了，但现在我不能改变背景。当我改变背景颜色，而不是背景图像时，它就会起作用。

有没有人能看看我错过了什么？

http://jsfiddle.net/pfwwv/28/

$(document).ready(function(){
// attach a waypoint to each div.waypoint element
// the callback is executed every time the user scrolls past 
// see http://imakewebthings.com/jquery-waypoints/#docs
$('.waypoint').waypoint(function(direction){
    // you can use the direction parameter here to check which way the user was     scrolling if you need

    // get the background-image source from the data-src property on the DOM element
    var backgroundSrc = $(this).attr('data-src');

    // now update the CSS for the body
    $(document.body).css({
     'background-image': backgroundSrc
    });
 });

})；

Answer 1

$(document.body).css({
    'background-image': 'url(' + backgroundSrc + ')'
});

Setting background-image using jQuery CSS property