Traversing/API/jQuery - Sample Code
prevAll([expr])
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script src="/jquery/js/jquery.js"></script>
<script>
$(document).ready(function(){
$("div:last").prevAll().addClass("before");
});
</script>
<style>
div { width:70px; height:70px; background:#abc;
border:2px solid black; margin:10px; float:left; }
div.before { border-color: red; }
</style>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
</body>
</html>
[実行結果]