第一步:HTML页面设计
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>树形菜单</title>
<link rel="stylesheet" href="../css/tree.css" />
<script src="../js/tree.js"></script>
</head>
<body>
<!--<span class="test" style="background-image: url('../img/plus.jpg');"> <!--1.设计网页布局-->
<ul id="outerul">
<li>名站导航
<ul>
<li><a href="#">毕丽巴</a></li>
<li><a href="#">旅游吧</a>
<ul>
<li>丽江</li>
<li>杭州</li>
<li>呼伦贝尔</li>
</ul>
</li>
<li><a href="#">狗粑粑</a></li>
<li><a href="#">驴妈妈</a></li>
</ul>
</li>
<li>常用软件
<ul>
<li>流氓软件</li>
<li>网络安全</li>
<li>理财软件</li>
<li>天猫多多</li>
</ul>
</li>
<li>热门游戏
<ul>
<li>王者农药</li>
<li>绝地求死</li>
<li>大话东游</li>
<li>狗熊联盟</li>
</ul>
</li>
<li>美女娱乐
<ul>
<li>赵丽英</li>
<li>林枝玲</li>
<li>范冰桶</li>
<li>安气辣</li>
</ul>
</li>
</ul>
</body>
</html>
第二步:CSS样式设计
body{font-size: 12px;line-height: 20px;}
#outerul{
text-align: left;
margin:0px;
padding: 0;cursor: pointer;
}
#outerurl ul lia{
text-decoration: none;color:black;
}
#outerul li{
margin:-2px 0 0 -20px;
padding: 0;
list-style: none;
}
#outerul .plus{
float:left;
width:32px;height: 15px;
background-position: 0 50%;
background-repeat: no-repeat;
background-size: cover;
border:1px solid #FF0000;
}
#outerul .sub{
float: left;width:18px;
height: 15px;
background-position: 0 50%;
background-size: cover;
background-repeat: no-repeat;
}
/*.test{display: block;background-repeat: no-repeat;}*/
第三部:JS设计
/*树形菜单:冒泡排序*/
var menu,subMenus,menuIcon;
function init(){
menuArray=document.getElementById('outerul').getElementsByTagName('li');
for(var i=0;i<menuArray.length;i++){
subMenus=menuArray[i].getElementsByTagName('ul');
if(subMenus.length>0){
menuIcon=document.createElement('span');
menuIcon.className='plus';
menuIcon.style.backgroundImage='url(../img/plus.jpg)';
menuIcon.οnclick=function(){
showHide(this.parentNode);
}
menuArray[i].insertBefore(menuIcon,menuArray[i].firstChild);
subMenus[0].style.display='none';
}else{
menuIcon=document.createElement('span');
menuIcon.className='sub';
menuIcon.style.backgroundImage='url(../img/2.jpg)';
menuArray[i].insertBefore(menuIcon,menuArray[i].firstChild);
}//end if
}
}
/*隐藏方法*/
function showHide(parentNode){
var ul=parentNode.getElementsByTagName('ul')[0];
ul.style.display=(ul.style.display=='none')?'block':'none';
var span=parentNode.getElementsByTagName('span')[0];
span.style.backgroundImage=(ul.style.display=='none')?'url(../img/plus.jpg':'url(../img/sub.jpg)';
}
window.οnlοad=init;
效果如下:
WEB入门实践视频课:https://edu.csdn.net/course/detail/8502