<%@ Page Language="C#" AutoEventWireup="true" CodeFile="NavigateMenu.aspx.cs" Inherits="NavigateMenu" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>無標(biāo)題頁</title>
<script type="text/javascript" src="JScript.js" ></script>
<style type="text/css">
*{
 margin: 0px;
 padding: 0px;
 border:0px;
}
#nav{
 width: 200px;
 margin: 0px;
 padding: 0px;
 font-size: 14px;
 line-height: 30px;
}
#nav li{
 width: 180px;
 padding-left: 20px;
 padding-bottom: 1px;
 list-style-image: none;
 list-style-type: none;
 background-color: #FFFFFF;
 float: left;
}
#nav a{
 padding-left: 20px;
 background-color: #BFBFBF;
 display: block;
 text-decoration: none;
}
#nav a:hover {
 background-color: #FF9175;
}
#nav li ul{
 padding-top: 1px;
 list-style-image: none;
 list-style-type: none;
}
#nav li li{
 padding-left: 0px;
}
#nav ul a{
 background-color: #EBEBEB;
}
.cx {
 display:none;
 visibility:hidden;
}
.ex {
 display:inherit;
 visibility:inherit;
}
</style>
<script type="text/javascript" >
window.onload=function()
{
 statUp();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div id="Parent">
<ul id="nav">
<li><a href="javascript:void(0);" onclick="doMenu(this)">菜單1</a>
 <ul>
 <li><a href="javascript:void(0);">菜單1_1</a></li>
 <li><a href="javascript:void(0);">菜單1_2</a></li>
 </ul>
</li>
<li><a href="javascript:void(0);" onclick="doMenu(this)">菜單2</a>
 <ul>
 <li><a href="javascript:void(0);">菜單2_1</a></li>
 <li><a href="javascript:void(0);">菜單2_2</a></li>
 </ul>
</li>
<li><a href="javascript:void(0);" onclick="doMenu(this)">菜單3</a>
 <ul>
 <li><a href="javascript:void(0);">菜單3_1</a></li>
 <li><a href="javascript:void(0);">菜單3_2</a></li>
 </ul>
</li>
</ul>
</div>
</form>
</body>
</html>

js文件：

function doMenu(obj){
 var items=obj.parentNode.getElementsByTagName("ul");
 var itmUl;
 if(items.length>0){
 itmUl=items[0];
 }
 if(itmUl.className!="ex"){
 cxAll();
 itmUl.className="ex";
 }else{
 itmUl.className="cx";
 }
}
function statUp(){
 cxAll();
}
function cxAll(){
 var ulDom=document.getElementById("nav");
 var items=ulDom.getElementsByTagName("ul");
 for (var i=0;i<items.length;i++)
 {
 items[i].className="cx";
 }
}

在這里需要注意的是延遲加載的問題，由于頁面加載時需要執(zhí)行預(yù)處理操作statUp()方法，js單獨(dú)寫成一個文件或 js寫在<head>節(jié)點(diǎn)中時，需要使用window.onload=function(){執(zhí)行語句;} 延遲加載，不然引用DOM中對象時，會出現(xiàn)缺少對象錯誤提示。

別一種解決方法，直接將所有javaScript 寫在</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>菜單</title>
<script type="text/javascript" src="Untitled-3.js"></script>
<style>
*{
 margin: 0px;
 padding: 0px;
 border:0px;
}
#nav{
 width: 200px;
 margin: 0px;
 padding: 0px;
 font-size: 14px;
 line-height: 30px;
}
#nav li{
 width: 180px;
 padding-left: 20px;
 padding-bottom: 1px;
 list-style-image: none;
 list-style-type: none;
 background-color: #FFFFFF;
 float: left;
}
#nav a{
 padding-left: 20px;
 background-color: #BFBFBF;
 display: block;
 text-decoration: none;
}
#nav a:hover {
 background-color: #FF9175;
}
#nav li ul{
 padding-top: 1px;
 list-style-image: none;
 list-style-type: none;
}
#nav li li{
 padding-left: 0px;
}
#nav ul a{
 background-color: #EBEBEB;
}
.cx {
 display:none;
 visibility:hidden;
}
.ex {
 display:inherit;
 visibility:inherit;
}
</style>
</head>
<body>
<div id="Parent">
<ul id="nav">
<li><a href="javascript:void(0);" onclick="doMenu(this)">菜單1</a>
 <ul>
 <li><a href="javascript:void(0);">菜單1_1</a></li>
 <li><a href="javascript:void(0);">菜單1_2</a></li>
 </ul>
</li>
<li><a href="javascript:void(0);" onclick="doMenu(this)">菜單2</a>
 <ul>
 <li><a href="javascript:void(0);">菜單2_1</a></li>
 <li><a href="javascript:void(0);">菜單2_2</a></li>
 </ul>
</li>
<li><a href="javascript:void(0);" onclick="doMenu(this)">菜單3</a>
 <ul>
 <li><a href="javascript:void(0);">菜單3_1</a></li>
 <li><a href="javascript:void(0);">菜單3_2</a></li>
 </ul>
</li>
</ul>
</div>
</body>
</html>
<script type="text/javascript">
function doMenu(obj){
 var items=obj.parentNode.getElementsByTagName("ul");
 var itmUl;
 if(items.length>0){
 itmUl=items[0];
 }
 if(itmUl.className!="ex"){
 cxAll();
 itmUl.className="ex";
 }else{
 itmUl.className="cx";
 }
}
function statUp(){
 cxAll();
 //var ulDom=document.getElementById("nav");
 //var items=ulDom.getElementsByTagName("ul");
}
function cxAll(){
 var ulDom=document.getElementById("nav");
 var items=ulDom.getElementsByTagName("ul");
 for (var i=0;i<items.length;i++)
 {
 items[i].className="cx";
 }
 }
statUp();
</script>

更多關(guān)于JavaScript相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《JavaScript查找算法技巧總結(jié)》、《JavaScript動畫特效與技巧匯總》、《JavaScript錯誤與調(diào)試技巧總結(jié)》、《JavaScript數(shù)據(jù)結(jié)構(gòu)與算法技巧總結(jié)》、《JavaScript遍歷算法與技巧總結(jié)》及《JavaScript數(shù)學(xué)運(yùn)算用法總結(jié)》

希望本文所述對大家JavaScript程序設(shè)計(jì)有所幫助。

您可能感興趣的文章: