<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
</head>
<body>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
<script>
var time1 = new Date()
for (var i = 0; i < 1000; i++) {
$("div.b:eq(1)").html()
}
time1 = ((new Date()).getTime() - time1.getTime());
var time2 = new Date()
for (var i = 0; i < 1000; i++) {
$('div.b').eq(1).html()
}
time2 = ((new Date()).getTime() - time2.getTime());
var time3 = new Date()
for (var i = 0; i < 1000; i++) {
$("div.b").find(":eq(1)").html()
}
time3 = ((new Date()).getTime() - time3.getTime());
var time4 = new Date()
for (var i = 0; i < 1000; i++) {
$(":eq(1)", "div.b").html()
}
time4 = ((new Date()).getTime() - time4.getTime());
alert([time1, time2, time3, time4])
</script>
</body>
</html>