大家看我写的对吗
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>jauery</title>
<style type="text/css" media="screen">
*{padding:0;margin:0;}
ul{list-style: none;margin-left: 20px;}
li{float: left;}
a{text-decoration:none;height:40px;width:100px;background-color: #ccc;display:block;text-align: center;line-height: 40px;margin-bottom: 15px;}
.on,a:hover{background-color: #ecc;color: #fff;
}
</style>
<script type="text/javascript" src="http://libs.baidu.com/jquery/1.9.1/jauery.js">
$(function(){
$('a').hover(
function(){
$(this).stop().animate({"width":"160px"},200);
},
function(){
$(this).stop().animate({"width":"120px"},200);
}
)
})
</script>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
</head>
<body>
<ul>
<li><a class="on" href="" title="">首页</a></li>
<li><a href="" title="">资讯</a></li>
<li><a href="" title="">新闻</a></li>
<li><a href="" title="">产品展示</a></li>
</ul>
</body>
</html>
