048-封装juery.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style>
div{ width:50px; height:50px; float:left; margin-left:10px; background:red;}
</style>
<script type="text/javascript" src="js/Ybjquery.js"></script>
<script>
$(function(){
	$("div").eq(2).css("background","green");
});
</script>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</body>
</html>