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How to use JS to make a list expand, shrink and expand function

php中世界最好的语言Original: 2017-12-30 17:44:192355browse

What I bring to you this time is how to use JS to create a list expansion and contraction function. The list expansion and contraction function is a very practical function. This article will give you a good analysis.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
ul,h2{margin:0; padding:0;}
li{list-style-type:none;}
#list{margin:0 auto; border:#333 solid 1px; width:250px;}
#list h2 {background: url(../img/ico1.gif) no-repeat 5px 14px #0C6; text-indent:20px; height:32px; line-height:32px;}
#list ul li{text-indent:25px; border-bottom:#333 solid 1px; line-height:24px; height:23px; }
#list .active{background: url(../img/ico2.gif) no-repeat 5px 14px #693; text-indent:20px; height:30px; line-height:30px;}
#list ul{display:none;}
.hover{background:#CFC;}
</style>
<script>
window.onload = function(){
var oUl = document.getElementById("list");
var aUl =oUl.getElementsByTagName("ul");
var aH2 = oUl.getElementsByTagName("h2");
var aLi = null;
var arrLi = [];
var that = null;
for(i=0;i<aH2.length;i++){
 aH2[i].index = i;
 aH2[i].onclick = function(){
 if(this.className==&#39;&#39;){
 for(i=0;i<aH2.length;i++){
aH2[i].className=&#39;&#39;;
aUl[i].style.display=&#39;none&#39;;
 }
this.className=&#39;active&#39;;
aUl[this.index].style.display = &#39;block&#39;;
}else{
this.className=&#39;&#39;;
aUl[this.index].style.display=&#39;none&#39;;
 }
             }
 }
for(i=0;i<aUl.length;i++){
  aLi =aUl[i].getElementsByTagName("li");
 for(j=0;j<aLi.length;j++){
  arrLi.push(aLi[j]);
 }
}
for(var i=0;i<arrLi.length;i++){
 arrLi[i].onclick = function(){
  for(i=0; i<arrLi.length;i++){ 
arrLi[i].className=&#39;&#39;;
 }
this.className = &#39;hover&#39;;
}
}
};
</script>
</head>
<body>
<ul id="list">
<li class="lis">
  <h2>我的好友</h2>
  <ul>
  <li>张三</li>
   <li>张四</li>
   <li>张五</li>
   <li>张六</li>
  </ul>
 </li>
 <li class="lis">
 <h2>企业好友</h2>
  <ul>
  <li>李四</li>
   <li>李小四</li>
   <li>李四二</li>
   <li>李毅</li>
   <li>李二</li>
  </ul>
 </li>
 <li class="lis">
 <h2>黑名单</h2>
  <ul>
  <li>张三</li>
  <li>李四</li>
  </ul>
 </li>
</ul>
</body>
</html>

I believe you have mastered the method after reading the above introduction. For more exciting information, please pay attention to other related articles on the php Chinese website!

How to use JS to make a list expand, shrink and expand function

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