js自定义QQ菜单效果

时间:2020-05-15 光明大神棍人气:0

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>
<meta http-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 ( var i = 0; i < aUl.length; i++ ) {
 aLi = aUl[i].getElementsByTagName('li');
 for ( var j = 0; j < aLi.length; j++ ) {
  arr.push(aLi[j]);
 }
 }
 // 遍历aLi
 for ( var i = 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>
<ul id="list">
 <li class="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>
 <li class="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>
 <li class="lis">
 <h2>黑名单</h2>
 <ul>
  <li>王五1</li>
  <li>王五2</li>
 </ul>
 </li>
</ul>
</body>
</html>

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