<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>jquery test</title>
<script src="jquery-1.11.1.min.js"></script>
<style type="text/css">
.show
{
width: 500px;
height: 50px;
background-color: red;
}
</style>
</head>
<body>
<div class="show"></div>
<script>
var browser_width = $(document.body).width();
$("div.show").css("width",browser_width);
$(window).resize(function() {
browser_width = $(document.body).width();
$("div.show").css("width",browser_width);
});
</script>
</html>
