JS淘宝商品广告效果

ul{ margin: 0; padding: 0; }
li{ list-style: none; }

#ad{ width: 298px; height: 208px; border: 1px #ff6300 solid; padding: 4px 1px; text-align: center; }
#ad .listL{ float: left; }
#ad .listR{ float: right; }
#ad li{ width: 48px; height: 26px; border: 1px #ffadad solid; background: #fff7f7; color: #333; line-height: 26px; margin-bottom: 2px; cursor: pointer; }
#ad img{ height: 206px; width: 188px; background: url(images/loader_ico.gif) no-repeat center center; }
#ad .cur{ background: #ff8494; color: #fff }

<div id="ad">
<ul class="listL">
<!--  <li class="cur"></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li> -->
</ul>
<a href="#"><img src="" alt=""></a>
<ul class="listR">
<!-- <li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li> -->
</ul>
</div>

window.onload = function(){
var oDiv = document.getElementById('ad');
var aUl = oDiv.getElementsByTagName('ul');
var oImg = oDiv.getElementsByTagName('img')[0];
var aImg = ['images/pic1.jpg','images/pic2.jpg','images/pic3.jpg','images/pic4.jpg','images/pic5.png','images/pic6.png','images/pic7.png','images/pic8.png','images/pic1.jpg','images/pic2.jpg','images/pic3.jpg','images/pic4.jpg','images/pic5.png','images/pic6.png'];
var aTxt = ['连衣裙','T恤','雪纺','铅笔裤','婚纱','外套','连体裤','包包','凉鞋','单鞋','太阳镜','丝袜','帆布鞋','情侣鞋'];
var len = aImg.length;
var oldNum = 0;
var num = 0;
var timer = null;
var speed = 1;

// 创建添加左右两侧li
for( var i = 0; i < len/2; i++){
aUl[0].innerHTML += '<li>'+ aTxt[i] +'</li>'
aUl[1].innerHTML += '<li>'+ aTxt[i + len/2] +'</li>'
}

var aLiL = aUl[0].getElementsByTagName('li');
var aLiR = aUl[1].getElementsByTagName('li');
var arrLi = [];
// 将遍历的所有li添加到数组arrLi中
for( var i = 0; i < aLiL.length; i++){
arrLi.push(aLiL[i]);
}
for( var i = 0; i < aLiR.length; i++){
arrLi.push(aLiR[i]);
}
// console.log(arrLi.length);

// 函数初始化
function init(n){
oImg.src = aImg
;
arrLi[oldNum].className = '';
arrLi
.className = 'cur';
oldNum = n;
}
init(0);

// 鼠标经过li，图片切换
for(var i = 0; i < len; i++){
arrLi[i].index = i;
arrLi[i].onmouseover = function(){
init(this.index);
}
};

// 定时切换
function fnTimer(n){
timer = setInterval(function(){

// type1:顺序切换
/* n ++;
if(n == len){
n = 0;
}*/

// type2：倒序切换
if(n == len-1){
speed = -1;
}else if(n== 0){
speed = 1;
}
n += speed;
init(n);
},1000);
};
fnTimer(0);

// 鼠标移入，清除定时器
oDiv.onmouseover = function(){
clearInterval(timer);
};

// 鼠标移出，开启定时器
oDiv.onmouseout = function(){
fnTimer(oldNum);
};
};