实现简单的下拉菜单功能的三种方法

来源：个人技术集锦

这篇文章主要介绍了js,jq,css多方面实现简易下拉菜单功能,需要的朋友可以参考下

效果图预览

这里写图片描述

一、css实现

html代码部分

css部分

二、js实现

html和js部分（实现方法一）

html和js部分（实现方法二）

css部分

三、JQ实现

html和jq部分

<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title>JS下拉菜单</title>
 <link rel="stylesheet" type="text/css" href="css/style.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
 </head>
 <body>
 <ul class="menu" id="menu">
 <li>
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a>
 </li>
 <li>
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >菜单一</a>
 <ul>
 <li>内容一</li>
 <li>内容一</li>
 <li>内容一</li>
 </ul>
 </li>
 <li>
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >菜单二</a>
 <ul class="show">
 <li>内容二</li>
 <li>内容二</li>
 <li>内容二</li>
 </ul>
 </li>
 <li>
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >菜单三</a>
 <ul class="hide">
 <li>内容三</li>
 <li>内容三</li>
 <li>内容三</li>
 </ul>
 </li>
 <li>
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >菜单四</a>
 </li>
 </ul>
 <script type="text/javascript" src="../../jq/jquery-1.7.2.min.js"></script>
 <script type="text/javascript"> 
 $(function(){
 $(".menu li").hover(function(){
 $(this).children("ul").show();
 },function(){
 $(this).children("ul").hide();
 });
 });
 </script>
 </body>
</html>

css部分

*{
 padding: 0;
 margin: 0;
}
a{
 text-decoration: none;
 color: #000;
}
ul,li{
 list-style: none;
}
.menu{
 margin: 50px auto;
 width: 500px;
 height: 35px;
 background-color: #ccc;
 text-align: center;
 line-height: 35px;
}
.menu li{
 float: left;
 width: 20%;
 position: relative;
}
.menu li a{
 display: block; 
}
.menu li a:hover{
 background-color: burlywood;
}
.menu li ul{
 display: none;
 position: absolute;
 left: 0;
}
.menu li ul li{
 width: 100%;
 margin-top: 2px;
 background-color: darkgray;
}
.menu li ul li:hover{
 cursor: pointer;
 background-color: chartreuse;
}

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实现简单的下拉菜单功能的三种方法