:visible：表示查询所有显示的标签
或:not(:hidden)
<html> ?<head> ???<meta http-equiv="content-type" content="text/html; charset=UTF-8"> ???<script type="text/javascript" src="../js/jquery-1.6.js"></script> ?</head> ?<body> ???<table border="1" align="center"> ?????<tr style="display:none"> ???????<td>Value 1</td> ?????</tr> ?????<tr> ???????<td>Value 2</td> ?????</tr> ?????<tr> ???????<td>Value 3</td> ?????</tr> ???</table> ???<script type="text/javascript"> ???????//1)查找隐藏的tr元素的个数 ???????//alert($("table tr:hidden").size()); ???????//alert($("tr:hidden").size()); ???????//2)查找所有可见的tr元素的个数 ???????//alert($("table tr:visible").size()); ???????//alert($("table tr:not(:hidden)").size()); ???</script> ?</body></html>jQuery可见性选择器
原文地址：http://blog.51cto.com/357712148/2113189