jq 表格隔行变色

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>demo-jquery表格奇偶行变色</title>
<style type="text/css">
.datalist tr.altrow{  
     background-color:#33CCFF; //隔行变色  
}
</style>
<script src="jquery.min.js"></script>
<script language="javascript">
 $(function() {  
     $("table.datalist tr:nth-child(odd)").addClass("altrow");  
});  

</script>
</head>
<body>
<table class="datalist" summary="list of members in EE Studay" id="oTable">
  <tr>
    <td>isaac</td>
    <td>isaac</td>
  </tr>
  <tr>
    <td>isaac</td>
    <td>isaac</td>
  </tr>
  <tr>
    <td>isaac</td>
    <td>isaac</td>
  </tr>
</table>
</body>
</html>