jQuery检测返回值的数据类型

<style type="text/css">
div
{
 width:200px;
 height:100px;
 background-color:#660;
} 
</style>

<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
 var width=$("div").css("width");
 alert(jQuery.type(width));
})
</script>

 <div></div>