奇数选择器
jQuery( ":odd" )
例：匹配表格的奇数行。
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="utf-8">
<title>odd demo</title>
<style>
table {
background: #f3f7f5;
}
</style>
<script
src="js/jquery-1.9.1.min.js"></script>
</head>
<body>
<table border="1">
<tr><td>Row with Index
#0</td></tr>
<tr><td>Row with Index
#1</td></tr>
<tr><td>Row with Index
#2</td></tr>
<tr><td>Row with Index
#3</td></tr>
</table>
<script>
$("tr:odd").css("background-color","#bbbbff");
</script>
</body>
</html>