The example in this article shares with you a drop-down menu similar to the left category navigation of JD.com and Taobao Mall for your reference. The specific content is as follows
Rendering:
Implementation code:
<!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</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
</dl>
</div>
</li>
<li>
<a href="">类别2</a>
<div class="div">
<dl>
<dd>类别2</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
</dl>
</div>
</li>
<li><a href="">类别3</a><div class="div">
<dl>
<dd>类别3</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
</dl>
</div>
</li>
<li><a href="">类别4</a><div class="div">
<dl>
<dd>类别4</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
</dl>
</div>
</li>
<li><a href="">类别5</a><div class="div">
<dl>
<dd>类别5</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
</dl>
</div>
</li>
<li><a href="">类别6</a><div class="div">
<dl>
<dd>类别6</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
</dl>
</div>
</li>
<li><a href="">类别7</a><div class="div">
<dl>
<dd>类别7</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
</dl>
</div>
</li>
<li><a href="">类别8</a><div class="div">
<dl>
<dd>类别8</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
<dd>类别1</dd>
</dl>
</div>
</li>
</ul>
</body>
</html>
I hope this article will be helpful to everyone in learning javascript programming.
The phone cannot connect to the Bluetooth headset
windows picture viewer cannot display out of memory
How to delete elements in jquery
InstantiationException exception solution
attributeusage
Unknown error 3004 solution
How to format hard drive in linux
Detailed explanation of java displacement operator
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
