javascript实现列表滚动的方法

 function scroll_img(target,distance,show_width,li_width,mr){ this.distance=distance;  //每次移动距离 this.target=$("#"+target); this.show_width=show_width; //显示区域宽度 this.li_width=li_width;  //items宽度 this.mr=mr;     //items间距 this.scrollbar=$("#"+target).find('ul'); this.position=0; this.direction=1; } scroll_img.prototype={ version:1.00, author:"yangfeifei", date:2011-11-21, initialize:function(){ var t=this; t.scrollbar.css('position','relative'); //初始动作 t.autoplay(); t.scrollbar.mouseover(function(){t.stop();});  //鼠标移到图片上停止自动播放 t.scrollbar.mouseout(function(){t.autoplay();}); //鼠标移出图片开始自动播放 }, right:function(){ var t=this; (-t.position)0?t.position+=t.distance:t.position=t.position; if((-t.position)>0){ t.scrollbar.animate({left:t.position},500); t.direction=-1; } if((-t.position)==0){ t.scrollbar.animate({left:t.position},500); t.direction=1; } }, total_length:function(){ var t=this, total_num=t.scrollbar.find('li').length; return total_num*(t.li_width+t.mr)-(t.mr+t.show_width); }, autoplay:function(){ var t=this; t.setInt=setInterval(function(){ t.direction==1?t.right():t.left(); },3000); }, stop:function(){ var t=this; clearInterval(t.setInt); } } 

 /*CSS reset*/ body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td{margin:0;padding:0;font-family:arial,"宋体";} table{border-collapse:collapse;border-spacing:0;} fieldset,img{border:0;} address,caption,cite,code,dfn,em,strong,th,var{font-style:normal;font-weight:bold;} ol,ul{list-style-type:none;} caption,th{text-align:left;} h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal;}/*font-size:100%;的作用主要是改变它默认的大小，继承父体的字体大小*/ q:before,q:after{content:' ';} abbr,acronym{border:0;} .cb{clear:both;} .cl{clear:left;} .cr{clear:right;} .clearfix:after{content:".";display:block;height:0;clear:both;visibility:hidden;} .clearfix{display:inline-block;} * html .clearfix{height:1%;} .clearfix{display:block;} /*主体css*/ .scroll_img_wrap{width:612px;margin: 10px auto;} #scroll_img{width:590px;overflow:hidden;float:left;*position:relative;border: 1px #ccc solid;}/*可视区域宽度*/ .scroll_img_list{width:9999px;} .scroll_img_list li{float:left;width:140px;margin-right:10px;}/*items*/ .scroll_img_list li p{text-align:center;} .scroll_img_list li p a{text-decoration:none;color:#666;} .left_btn,.right_btn{float:left;}