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我在使用这个 jQuery 函数时遇到了问题，因为它不能正常工作，那就是 >> 获取第一个列表项并将其放在最后一个列表项之后（这就是产生无限效果的方式）'，我不能让它无限效果

<script type="text/javascript" language="javascript">
jQuery(document).ready(function() {  
        //move the last list item before the first item. The purpose of this is if the user clicks previous he will be able to see the last item.  
        //jQuery('#carousel_ul li:first').before(jQuery('#carousel_ul li:last'));  

        //when user clicks the image for sliding right  
        jQuery('#right_scroll img').click(function(){  

            //get the width of the items ( i like making the jquery part dynamic, so if you change the width in the css you won't have o change it here too ) '  
            var item_width = jQuery('#carousel_ul li').outerWidth() + 10;  

            //calculate the new left indent of the unordered list  
            var left_indent = parseInt(jQuery('#carousel_ul').css('left')) - item_width;  

            //make the sliding effect using jquery's anumate function '  
            jQuery('#carousel_ul').animate({'left' : left_indent},{queue:false, duration:500},function(){  

                //get the first list item and put it after the last list item (that's how the infinite effects is made) '  
                jQuery('#carousel_ul li:last').after(jQuery('#carousel_ul li:first'));  

                //and get the left indent to the default -210px  
                jQuery('#carousel_ul').css({'left' : '-210px'});  
            });  
        });  

        //when user clicks the image for sliding left  
       jQuery('#left_scroll img').click(function(){  

            var item_width = jQuery('#carousel_ul li').outerWidth() + 10;  

            /* same as for sliding right except that it's current left indent + the item width (for the sliding right it's - item_width) */  
            var left_indent = parseInt(jQuery('#carousel_ul').css('left')) + item_width;  

            jQuery('#carousel_ul').animate({'left' : left_indent},{queue:false, duration:500},function(){  

            /* when sliding to left we are moving the last item before the first item */  
            jQuery('#carousel_ul li:first').before(jQuery('#carousel_ul li:last'));  

            /* and again, when we make that change we are setting the left indent of our unordered list to the default -210px */  
           jQuery('#carousel_ul').css({'left' : '-210px'});  
            });  
        });  
  });  
</script>
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