JS實現(xiàn)仿QQ效果的三級豎向菜單

更新時間：2015年09月25日 10:08:39 作者：企鵝

這篇文章主要介紹了JS實現(xiàn)仿QQ效果的三級豎向菜單,以實例形式分析了JavaScript遍歷頁面元素及動態(tài)改變頁面css樣式的技巧,需要的朋友可以參考下

本文實例講述了JS實現(xiàn)仿QQ效果的三級豎向菜單。分享給大家供大家參考。具體如下：

這是一款仿QQ的三級菜單，豎向三級，兩級的比較多見，三級的不多哦，不過本菜單三級菜單沒有美化，你需要自己再美化一下。

運行效果截圖如下：

在線演示地址如下：

http://demo.jb51.net/js/2015/js-f-qq-3l-v-menu-style-codes/

具體代碼如下：

<html>
<head>
<title>仿QQ的菜單，三級豎向</title>
<script language="javascript">
function Switchmenu(obj){
if(document.getElementById){
var el = document.getElementById("menu_"+obj);
var ar = document.getElementById("menu").getElementsByTagName("ul"); 
if(el.style.display != "block"){ 
for (var i=0; i<ar.length; i++){
if (ar[i].className=="submenu")
ar[i].style.display = "none";
document.getElementById("menu"+(i+1)).className="menutbg_1 cursor"
}
el.style.display = "block";
document.getElementById("menu"+obj).className="menutbg_2 cursor"
}else{
el.style.display = "none";
document.getElementById("menu"+obj).className="menutbg_1 cursor"
}
}
}
</script>
<script language="javascript" id="clientEventHandlersJS">
<!--
var number=6;
function LMYC() {
var lbmc;
 for (i=1;i<=number;i++) {
 lbmc = eval('LM' + i);
 lbmc.style.display = 'none';
 }
}
function ShowFLT(i) {
 lbmc = eval('LM' + i);
 //treePic = eval('treePic' + i)
 if (lbmc.style.display == 'none') {
 LMYC();
 //treePic.src = 'images/nofile.gif';
 lbmc.style.display = '';
 }
 else {
 //treePic.src = 'images/file.gif';
 lbmc.style.display = 'none';
 }
}
//-->
 </script>
 <style type="text/css">
 <!--
 body{font-size:12px; margin:0; padding:0;}
 ul{list-style-type:none; margin:0; padding:0;}
 li{margin:0; padding:0;}
 #menu{background:#fff; width:182px; height:auto;margin:0 auto; border:1px solid #73C2FF;}
 .cursor{cursor:pointer;}
 .submenu{display: none;}
 .menutbg_1{background:url(images/m1.gif) no-repeat left; width:182px; height:25px; line-height:25px; color:#4B6486; font-size:14px; font-weight:700;text-align:left; text-indent:19px;}
 .menutbg_2{background:url(images/m1.gif) no-repeat left; width:182px; height:25px; line-height:25px; color:#4B6486; font-size:14px; font-weight:700; text-align:left;text-indent:19px;}
.mbox{background:#73C2FF;height:auto;}
.mt1{font-size:14px;height:22px;line-height:22px;background:#E5F5FF;text-indent:10px;border-top: 1px solid #fff;border-bottom: 1px solid #A9DAFF; font-weight:normal;cursor:pointer;}
 .TxtList{height:200px; overflow-y:scroll; background:#fff;}
 .mt3{height:22px; line-height:22px; text-indent:33px; color:#333; font-size:12px; no-repeat 20px 5px;}
</style>
-->
</style>
</head>
<body>
 <div id="menu">
  <div id="menu1" class="menutbg_1 cursor" onclick="Switchmenu('1')">一級菜單A</div>
  <ul id="menu_1" class="submenu">
<table cellspacing="0" cellpadding="0" width="100%" border="0" class="mbox">
  <tr>
   <td class="mt1"><a onclick="javascript:ShowFLT(1)" href="javascript:void(null)" style="text-decoration:none; color:#333;"> 文管產(chǎn)品</a> </td>
  </tr>
  <tr id="LM1" style="DISPLAY: none">
   <td><div class="TxtList">
   <div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="3">123213</a></div>
   </div></td>
  </tr>
  <tr>
   <td class="mt1"><a onclick="javascript:ShowFLT(2)" href="javascript:void(null)" style="text-decoration:none; color:#333;"> 桌面文具</a> </td>
  </tr>
  <tr id="LM2" style="DISPLAY: none">
   <td><div class="TxtList">
   <div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="3">123213</a></div>
</div></td>
  </tr>
  </table>
  </ul>
  <div id="menu2" class="menutbg_1 cursor" onclick="Switchmenu('2')">一級菜單B</div>
  <ul id="menu_2" class="submenu">
  <table cellspacing="0" cellpadding="0" width="100%" border="0" class="mbox">
  <tr>
   <td class="mt1"><a onclick="javascript:ShowFLT(3)" href="javascript:void(null)" style="text-decoration:none; color:#333;"> 文管產(chǎn)品</a> </td>
  </tr>
  <tr id="LM3" style="DISPLAY: none">
   <td><div class="TxtList">
<div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="3">123213</a></div>
      <div class="mt3"><a href="3">123213</a></div>
      <div class="mt3"><a href="#">123213</a></div>
</div></td>
  </tr>
  <tr>
   <td class="mt1"><a onclick="javascript:ShowFLT(4)" href="javascript:void(null)" style="text-decoration:none; color:#333;"> 桌面文具</a> </td>
  </tr>
  <tr id="LM4" style="DISPLAY: none">
   <td><div class="TxtList">
<div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="3">123213</a></div>
</div></td>
  </tr>
  </table>
  </ul>
  <div id="menu3" class="menutbg_1 cursor" onclick="Switchmenu('3')">一級菜單C</div>
  <ul id="menu_3" class="submenu">
       <table cellspacing="0" cellpadding="0" width="100%" border="0" class="mbox">
  <tr>
   <td class="mt1"><a onclick="javascript:ShowFLT(5)" href="javascript:void(null)" style="text-decoration:none; color:#333;"> 文管產(chǎn)品</a> </td>
  </tr>
  <tr id="LM5" style="DISPLAY: none">
   <td><div class="TxtList">
<div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="3">123213</a></div>
</div></td>
  </tr>
  <tr>
   <td class="mt1"><a onclick="javascript:ShowFLT(6)" href="javascript:void(null)" style="text-decoration:none; color:#333;"> 桌面文具</a> </td>
  </tr>
  <tr id="LM6" style="DISPLAY: none">
   <td><div class="TxtList">
<div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="#">123213</a></div>
      <div class="mt3"><a href="#">123213</a></div>
</div></td>
  </tr>
  </table>
  </ul>
 </div>
</body>
</html>

希望本文所述對大家的JavaScript程序設(shè)計有所幫助。

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