为什么attr可以获得属性值正常输出，但css不行望解答
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Page Title</title>
</head>
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<style>
*{
padding:0;
margin:0;
}
ul{
list-style: none;
z-index:20;
position: relative;
font-size: 15px;
}
li{
float: left;
cursor: pointer;
width: 100px;
height: 30px;
text-align: center;
line-height: 30px;
color: #fff;
font-weight: bold;
}
.menu{
width: 500px;
position: relative;
margin: 20px auto;
height: 32px;
box-shadow: 0 2px 20px #000;
background: #AF3434;
border-radius: 3px;
}
</style>
<script>
</script>
<body>
<div class="menu">
<ul>
<li name="0">首页</li>
<li name="1">php中文网</li>
<li name="2">独孤九剑</li>
<li name="3">西门大官人</li>
<li name=4>灭绝师太</li>
</ul>
<div class="block" style="z-index:10;width:100px;height:2px;background:#fff;position:absolute;top:30px;"></div>
</div>
</body>
</html>
<script>
$(function(){
$('li').hover(function(){
$('li').hover(
function(){
$x = parseInt($(this).attr('name'));//为什么不能用css来获取值
$('.block').stop().animate({left:100*$x+'px'},300);
},
function(){
$('.block').stop().animate({left:'0px'},200);
}
)
})
})
</script>