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ホームページ >ウェブフロントエンド >jsチュートリアル >JS は 3 レベルの折りたたみメニューの特殊効果を実装し、他のレベルは自動的に縮むことができます_javascript スキル

JS は 3 レベルの折りたたみメニューの特殊効果を実装し、他のレベルは自動的に縮むことができます_javascript スキル

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WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBオリジナル
2016-05-16 15:46:412017ブラウズ

この記事の例では、JS を使用した 3 レベルの折りたたみメニュー効果の実装について説明しており、他のレベルは自動的に縮小できます。参考までに共有します。IE6、IE7、IE8、FF、Chromeなどのブラウザで正常に動作します。
ヒント: CSS の #menu ul の {height:100px; overflow:auto;} を削除して、適応性を高めます
動作効果図は以下のとおりです。

実装コードは次のとおりです: 

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>三级折叠菜单</title>
<style>
*,body,ul,h1,h2{ margin:0; padding:0; list-style:none;}
body{font:12px "宋体"; padding-top:20px;}
a{ color:#777;border:none;}
#menu { width:200px; margin:auto;}
 #menu h1 { font-size:12px; border:#C60 1px solid; margin-top:1px; background-color:#F93;}
 #menu h2 { font-size:12px; border:#E7E7E7 1px solid; border-top-color:#FFF; background-color:#F4F4F4;}
 #menu ul { padding-left:15px; height:100px;border:#E7E7E7 1px solid; border-top:none;overflow:auto;}
 #menu a { display:block; padding:5px 0 3px 10px; text-decoration:none; overflow:hidden;}
 #menu a:hover{ color:#6F0; background:#000;}
 #menu .no {display:none;}
 #menu .h1 a{color:#6F0;}
 #menu .h2 a{color:#06F;}
 #menu h1 a{color:#FFF;}
</style>
<script language="JavaScript">
<!--//
function ShowMenu(obj,n){
 var Nav = obj.parentNode;
 if(!Nav.id){
 var BName = Nav.getElementsByTagName("ul");
 var HName = Nav.getElementsByTagName("h2");
 var t = 2;
 }else{
 var BName = document.getElementById(Nav.id).getElementsByTagName("span");
 var HName = document.getElementById(Nav.id).getElementsByTagName("h1");
 var t = 1;
 }
 for(var i=0; i<HName.length;i++){
 HName[i].innerHTML = HName[i].innerHTML.replace("-","+");
 HName[i].className = "";
 }
 obj.className = "h" + t;
 for(var i=0; i<BName.length; i++){if(i!=n){BName[i].className = "no";}}
 if(BName[n].className == "no"){
 BName[n].className = "";
 obj.innerHTML = obj.innerHTML.replace("+","-");
 }else{
 BName[n].className = "no";
 obj.className = "";
 obj.innerHTML = obj.innerHTML.replace("-","+");
 }
}
//-->
</script>
</head>
<body>
<div id="menu">
 <h1 onClick="javascript:ShowMenu(this,0)"><a href="javascript:void(0)">+ 一级菜单A</a></a></h1>
 <span class="no">
 <h2 onClick="javascript:ShowMenu(this,0)"><a href="javascript:void(0)">+ 一级菜单A_1</a></a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,1)"><a href="javascript:void(0)">+ 一级菜单A_2</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,2)"><a href="javascript:void(0)">+ 一级菜单A_3</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,3)"><a href="javascript:void(0)">+ 一级菜单A_4</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,4)"><a href="javascript:void(0)">+ 一级菜单A_5</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,5)"><a href="javascript:void(0)">+ 一级菜单A_6</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,6)"><a href="javascript:void(0)">+ 一级菜单A_7</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,7)"><a href="javascript:void(0)">+ 一级菜单A_8</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,8)"><a href="javascript:void(0)">+ 一级菜单A_9</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,9)"><a href="javascript:void(0)">+ 一级菜单A_10</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,10)"><a href="javascript:void(0)">+ 一级菜单A_11</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,11)"><a href="javascript:void(0)">+ 一级菜单A_12</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">一级菜单A_0</a>
  <a href="javascript:void(0)">一级菜单A_1</a>
  <a href="javascript:void(0)">一级菜单A_2</a>
  <a href="javascript:void(0)">一级菜单A_3</a>
  <a href="javascript:void(0)">一级菜单A_4</a>
  <a href="javascript:void(0)">一级菜单A_5</a>
  <a href="javascript:void(0)">一级菜单A_6</a>
  <a href="javascript:void(0)">一级菜单A_7</a>
  <a href="javascript:void(0)">一级菜单A_8</a>
  <a href="javascript:void(0)">一级菜单A_9</a>
 </ul>
 </span>
    
 <h1 onClick="javascript:ShowMenu(this,1)"><a href="javascript:void(0)">+ 二级菜单B</a></h1>
 <span class="no">
 <h2 onClick="javascript:ShowMenu(this,0)"><a href="javascript:void(0)">+ 二级菜单B_1</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">二级菜单B_0</a>
  <a href="javascript:void(0)">二级菜单B_1</a>
  <a href="javascript:void(0)">二级菜单B_2</a>
  <a href="javascript:void(0)">二级菜单B_3</a>
  <a href="javascript:void(0)">二级菜单B_4</a>
  <a href="javascript:void(0)">二级菜单B_5</a>
  <a href="javascript:void(0)">二级菜单B_6</a>
  <a href="javascript:void(0)">二级菜单B_7</a>
  <a href="javascript:void(0)">二级菜单B_8</a>
  <a href="javascript:void(0)">二级菜单B_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,1)"><a href="javascript:void(0)">+ 二级菜单B_2</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">二级菜单B_0</a>
  <a href="javascript:void(0)">二级菜单B_1</a>
  <a href="javascript:void(0)">二级菜单B_2</a>
  <a href="javascript:void(0)">二级菜单B_3</a>
  <a href="javascript:void(0)">二级菜单B_4</a>
  <a href="javascript:void(0)">二级菜单B_5</a>
  <a href="javascript:void(0)">二级菜单B_6</a>
  <a href="javascript:void(0)">二级菜单B_7</a>
  <a href="javascript:void(0)">二级菜单B_8</a>
  <a href="javascript:void(0)">二级菜单B_9</a>
 </ul>
 </span>
  
 <h1 onClick="javascript:ShowMenu(this,2)"><a href="javascript:void(0)">+ 三级菜单C</a></h1>
 <span class="no">
 <h2 onClick="javascript:ShowMenu(this,0)"><a href="javascript:void(0)">+ 三级菜单C_1</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">三级菜单C_0</a>
  <a href="javascript:void(0)">三级菜单C_1</a>
  <a href="javascript:void(0)">三级菜单C_2</a>
  <a href="javascript:void(0)">三级菜单C_3</a>
  <a href="javascript:void(0)">三级菜单C_4</a>
  <a href="javascript:void(0)">三级菜单C_5</a>
  <a href="javascript:void(0)">三级菜单C_6</a>
  <a href="javascript:void(0)">三级菜单C_7</a>
  <a href="javascript:void(0)">三级菜单C_8</a>
  <a href="javascript:void(0)">三级菜单C_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,1)"><a href="javascript:void(0)">+ 三级菜单C_2</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">三级菜单C_0</a>
  <a href="javascript:void(0)">三级菜单C_1</a>
  <a href="javascript:void(0)">三级菜单C_2</a>
  <a href="javascript:void(0)">三级菜单C_3</a>
  <a href="javascript:void(0)">三级菜单C_4</a>
  <a href="javascript:void(0)">三级菜单C_5</a>
  <a href="javascript:void(0)">三级菜单C_6</a>
  <a href="javascript:void(0)">三级菜单C_7</a>
  <a href="javascript:void(0)">三级菜单C_8</a>
  <a href="javascript:void(0)">三级菜单C_9</a>
 </ul>
 </span>
  
 <h1 onClick="javascript:ShowMenu(this,3)"><a href="javascript:void(0)">+ 四级菜单D</a></h1>
 <span class="no">
 <h2 onClick="javascript:ShowMenu(this,0)"><a href="javascript:void(0)">+ 四级菜单D_1</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">四级菜单D_0</a>
  <a href="javascript:void(0)">四级菜单D_1</a>
  <a href="javascript:void(0)">四级菜单D_2</a>
  <a href="javascript:void(0)">四级菜单D_3</a>
  <a href="javascript:void(0)">四级菜单D_4</a>
  <a href="javascript:void(0)">四级菜单D_5</a>
  <a href="javascript:void(0)">四级菜单D_6</a>
  <a href="javascript:void(0)">四级菜单D_7</a>
  <a href="javascript:void(0)">四级菜单D_8</a>
  <a href="javascript:void(0)">四级菜单D_9</a>
 </ul>
 <h2 onClick="javascript:ShowMenu(this,1)"><a href="javascript:void(0)">+ 四级菜单D_2</a></h2>
 <ul class="no">
  <a href="javascript:void(0)">四级菜单D_0</a>
  <a href="javascript:void(0)">四级菜单D_1</a>
  <a href="javascript:void(0)">四级菜单D_2</a>
  <a href="javascript:void(0)">四级菜单D_3</a>
  <a href="javascript:void(0)">四级菜单D_4</a>
  <a href="javascript:void(0)">四级菜单D_5</a>
  <a href="javascript:void(0)">四级菜单D_6</a>
  <a href="javascript:void(0)">四级菜单D_7</a>
  <a href="javascript:void(0)">四级菜单D_8</a>
  <a href="javascript:void(0)">四级菜单D_9</a>
 </ul>
 </span>
</div>
</body>
</html>

この記事が皆様の JavaScript プログラミング設計に役立つことを願っています。

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