javascript仿京东导航左侧分类导航下拉菜单效果
aubin 人气:0本文实例为大家分享了类似于京东、淘宝商城左侧分类导航下拉菜单，供大家参考，具体内容如下
效果图：
实现代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title></title>
<style>
*{margin:0;padding:0;}
.ul{position:relative;width:200px;height:auto;}
.ul li{height:24px;line-height:24px;border-bottom:1px solid #ddd;text-align:center;font-size:12px;}
.ul li a{display:block;background:#fff;color:#000;text-decoration:none;}
.ul li a:hover{display:block;background:#000;color:#fff;text-decoration:none;}
.ul li div{display:none;width:400px; height:auto;position:absolute;top:0;left:200px; background:#000; color:#fff;}
.ul li div dl dd{float:left; width:100px;}
.ul .liname div{display:block;}
</style>
<script>
window.onload=function(){
var aLi=document.getElementsByTagName("li");
for(var i=0;aLi.length>i;i++){
aLi[i].i=i;
aLi[i].onmouseover=function(){
this.className="liname";
var h1=this.i*25;
var h2=this.getElementsByTagName("div")[0].offsetHeight;
if(h2<h1){
this.getElementsByTagName("div")[0].style.top=h1+'px';
}
}
aLi[i].onmouseout=function(){
this.className="";
}
}
}
</script>
</head>
<body>
<ul class="ul">
<li>
<a href="">类别1</a>
<div class="div">
<dl>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<https://img.qb5200.com/download-x/dl>
</div>
</li>
<li>
<a href="">类别2</a>
<div class="div">
<dl>
<dd>类别2<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<https://img.qb5200.com/download-x/dl>
</div>
</li>
<li><a href="">类别3</a><div class="div">
<dl>
<dd>类别3<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<https://img.qb5200.com/download-x/dl>
</div>
</li>
<li><a href="">类别4</a><div class="div">
<dl>
<dd>类别4<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<https://img.qb5200.com/download-x/dl>
</div>
</li>
<li><a href="">类别5</a><div class="div">
<dl>
<dd>类别5<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<https://img.qb5200.com/download-x/dl>
</div>
</li>
<li><a href="">类别6</a><div class="div">
<dl>
<dd>类别6<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<https://img.qb5200.com/download-x/dl>
</div>
</li>
<li><a href="">类别7</a><div class="div">
<dl>
<dd>类别7<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<https://img.qb5200.com/download-x/dl>
</div>
</li>
<li><a href="">类别8</a><div class="div">
<dl>
<dd>类别8<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<dd>类别1<https://img.qb5200.com/download-x/dd>
<https://img.qb5200.com/download-x/dl>
</div>
</li>
</ul>
</body>
</html>
希望本文所述对大家学习javascript程序设计有所帮助。
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