js自定义QQ菜单效果的教程
QQ菜单大家都见过,这样有以下的功能:
1.点击我的好友,会展示下拉出具体的好友
2.再点击我的好友,会收缩
3.首次点击具体的某个好友,只有当前这个好友高亮
4.再次点击这个好友时,高亮状态就消失了
还是瞄一眼效果图吧:
最后代码
<html> <head> <metahttp-equiv="Content-Type"content="text/html; charset=utf-8"/> <style> ul,h2 {padding:0;margin:0;} li{list-style:none;} #list{width:200px;margin:0 auto;border:1px solid #000;} #list{width:200px;} #list h2{width:200px;height:30px;line-height:30px;text-align:center;background:url(img/ico1.gif) no-repeat 20% 50% #6699FF;text-indent:24px;border-bottom:1px dotted #000;} #list h2.active{background:url(img/ico2.gif) no-repeat 20% 50% #FFCC99;} #list ul{width:200px;text-align:center;display:none;} #list ul li{width:200px;height:30px;line-height:30px;} #list ul li.highlight{background:#FF66FF;} </style> <title>无标题文档</title> <script> window.onload = function () { var oUl = document.getElementById('list'); var oH2 = oUl.getElementsByTagName('h2'); var aUl = oUl.getElementsByTagName('ul'); var aLi = []; var arr = []; var oldLi = null; var num = 0;
// 点击菜单显示隐藏 for( var i = 0; i <oH2.length; i++ ) { oH2[i].index= i; oH2[i].onclick=function() { if (this.className === '') { aUl[this.index].style.display='block'; this.className='active'; } else { aUl[this.index].style.display='none'; this.className=''; } } } // 获取菜单中的每个li for ( vari=0; i < aUl.length; i++ ) { aLi=aUl[i].getElementsByTagName('li'); for ( varj=0; j < aLi.length; j++ ) { arr.push(aLi[j]); } } // 遍历aLi for ( vari=0; i < arr.length; i++ ) { arr[i].onOff=false; arr[i].onclick=function() { // 当上一个点击的li不是当前点击的Li if (oldLi && oldLi !== this) { oldLi.className=''; oldLi.onOff=false; } this.className= this.onOff ? '' : 'highlight'; this.onOff = !this.onOff; oldLi=this; } } } </script> </head>
<body> <ulid="list"> <liclass="lis"> <h2>我的好友</h2> <ul> <li>张三1</li> <li>张三2</li> <li>张三3</li> </ul> </li> <liclass="lis"> <h2>企业好友</h2> <ul> <li>李四1</li> <li>李四2</li> <li>李四3</li> </ul> </li> <liclass="lis"> <h2>黑名单</h2> <ul> <li>王五1</li> <li>王五2</li> </ul> </li> </ul> </body> </html> |