jquery实现导航nav

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先规范JQuery代码结构组织如下

1，index.html

<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>Try JQuery</title>
  <link rel="stylesheet" href="styles/main.css" type="text/css" />
 </head>
 <body>
  <div id="main_container">
   test
  </div>
  <script src="scripts/jquery-1.10.2.min.js" type="text/javascript"></script>
  <script src="scripts/main.js" type="text/javascript"></script>
 </body>
</html>

2，styles/main.css

#main_container {
 background-color: gray;
 width: 960px;
 margin: 0 auto;
}

3，scripts/main.js

$(document).ready(function(){
 alert("Hello");
});

$(function(){
 alert("World");
});

实现一个简单的导航栏

1，index.html

<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
		<title>Try JQuery</title>
		<link rel="stylesheet" href="styles/main.css" type="text/css" />
	</head>
	<body>
		<div id="main_container">
			<div id="navigation">
				<ul>
					<li><a href="#">首页</a></li>
					<li><a href="#">旅店</a>
						<ul>
							<li><a href="#">单人间</a></li>
							<li><a href="#">双人间</a></li>
						</ul>
					</li>
					<li><a href="#">联系我们</a></li>
				</ul>
			</div>
			<div class="clear" />
			<div>
				test
			</div>
		</div>
		<script src="scripts/jquery-1.10.2.min.js" type="text/javascript"></script>
		<script src="scripts/main.js" type="text/javascript"></script>
	</body>
</html>

2，styles/main.css

/*
 base css
*/

* {
	margin: 0;
	padding: 0;
}

ul, li {
	list-style: none outside none;
}

.clear {
	clear: both;
}

/*
 page css
*/

#main_container {
	background-color: #eeeeee;
	width: 960px;
	margin: 0 auto;
}

#navigation {
	width: 960px;
}

#navigation ul li {
	float: left;
	margin-right: 20px;
	z-index:100;
	position: relative;
}

#navigation ul li a {
	display: block;
	background: #eeeeee;
	font-weight: 700;
}

#navigation ul li a:hover {
	background: none;
	color: red;
}

#navigation ul li ul {
	display: none;
	overflow: hidden;
	position: absolute;
	background-color: #88C366;
	width: 80px;
}

#navigation ul li:hover ul {
	display: block;
	position: absolute;
	width: 100px;
}

#navigation ul li ul li{
	border-bottom: 1px solid #BBB;
	text-align: left;
	width: 100%;
}

3，scripts/main.js

//导航效果（兼容IE6）
$(function(){
	$("#navigation ul li:has(ul)").hover(function(){
			$(this).children("ul").stop(true,true).slideDown(1000);
		},function(){
			$(this).children("ul").stop(true,true).slideUp("fast");
	});
})

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