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td:nth-child(odd){border-left:2px solid red}
td:nth-child(even){border-left:2px solid blue}
<!DOCTYPE html>
<html>
<head>
<title>无标题页</title>
<style type="text/css">
/*CSS3 nth-child() 选择器*/
td:nth-child(odd){border-left:2px solid red}
td:nth-child(even){border-left:2px solid blue}
</style>
<script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.9.1/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
/*$(document).ready(function(){
$("#mytable").find("td").css("border-left", "2px solid red");
$("#mytable").find("td:odd").css("border-left", "2px solid blue");
});*/
</script>
</head>
<body>
<table id="mytable">
<tr>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
</body>
</html>
html,body{height:100%;}