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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script src="../lib/jquery/jquery-1.9.1.js"></script>
<style>
.lv0{
width:500px;
height:100px;
border:1px solid #321;
}
.lv1{
width:90%;
height:90px;
}
.lv2{
width:50%;
height:80px;
border:1px solid #aa5;
}
</style>
</head>
<body>
<div class='lv0'>
<div class='lv1'>
<div class='lv2' id='toGet'>
</div>
</div>
</div>
<script>
var $a = $("#toGet").width();
</script>
</body>
</html>
<style>
#div1{height:100px;width:100px;background-color:yellow}
#div2{height:90%;width:90%;background-color:red;margin:0 auto}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type='text/javascript'>
$(function(){
alert($("#div2").width()+"px");
})
</script>
<div id="div1">
<div id="div2">
yyyyyyy
</div>
</div>