【children_index】
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.5.2.js'></script>
<script type='text/javascript'>
$(window).load(function(){
$('div p').eq(2).css('background','yellow');
});
</script>
</head>
<body>
<div>
<p>test</p>
<p>test</p>
<p>test</p>
<p>test</p>
<p>test</p>
<p>test</p>
</div>
</body>
</html>
