基于JavaScript实现淘宝商品广告效果

本文实例为大家分享了JavaScript实现淘宝商品广告效果的具体代码，供大家参考，具体内容如下

CSS部分：

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 } 

HTML部分：

<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> 

JS部分：

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[n]; 
 arrLi[oldNum].className = ''; 
 arrLi[n].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); 
 }; 
 }; 

预览效果：