使用http://jonraasch.com/blog/a-simple-jquery-slideshow中的代码，我创建了一个jsfiddle。
问题是幻灯片在jsfiddle中不起作用，所以我不能根据需要修改它
会有什么问题呢？
http://jsfiddle.net/UUKP4/8/
代码：

function slideSwitch() {
            var $active = $('#slideshow IMG.active');
        
            if ( $active.length == 0 ) $active = $('#slideshow IMG:last');
        
            // use this to pull the images in the order they appear in the markup
            var $next =  $active.next().length ? $active.next()
                : $('#slideshow IMG:first');
                    
            $active.addClass('last-active');
        
            $next.css({opacity: 0.0})
                .addClass('active')
                .animate({opacity: 1.0}, 1000, function() {
                    $active.removeClass('active last-active');
                });
        }
        
        $(function() {
            setInterval( "slideSwitch()", 5000 );
        });
        
        </script>
        
        <style type="text/css">
        
        /*** set the width and height to match your images **/
        
        #slideshow {
            position:relative;
            height:350px;
        }
        
        #slideshow IMG {
            position:absolute;
            top:0;
            left:0;
            z-index:8;
            opacity:0.0;
        }
        
        #slideshow IMG.active {
            z-index:10;
            opacity:1.0;
        }
        
        #slideshow IMG.last-active {
            z-index:9;
        }
        
        </style>
        
                
        <div id="slideshow">
          <img src="http://jonraasch.com/img/slideshow/simple-jquery-slideshow.png" alt="Slideshow Image 1" class="active" />
          <img src="http://jonraasch.com/img/slideshow/mini-golf-ball.jpg" alt="Slideshow Image 2" />
          <img src="http://jonraasch.com/img/slideshow/jon-raasch.jpg" alt="Slideshow Image 3" />
          <img src="http://jonraasch.com/img/slideshow/ear-cleaning.jpg" alt="Slideshow Image 4" />
    </div>