$("table tr:hidden")
$("table tr:visible")
1 <html> 2 <head> 3 <meta http-equiv="content-type" content="text/html; charset=UTF-8"> 4 <script type="text/javascript" src="../js/jquery-1.8.2.js"></script> 5 </head> 6 <body> 7 <table border="1" align="center"> 8 <tr style="display:none"> 9 <td>Value 1</td> 10 </tr> 11 <tr> 12 <td>Value 2</td> 13 </tr> 14 <tr> 15 <td>Value 3</td> 16 </tr> 17 </table> 18 <script type="text/javascript"> 19 /*1)查找隐藏的tr元素的个数 20 */ 21 alert( $("table tr:hidden").size() ); 22 23 /*2)查找所有可见的tr元素的个数 24 alert( $("table tr:not(:hidden)").size() ); 25 alert( $("table tr:visible").size() ); 26 alert( $("tr:visible").size() ); 27 */ 28 29 </script> 30 </body> 31 </html>
原文：http://www.cnblogs.com/friends-wf/p/3808802.html