1 $(".list2 li:nth-child(10n)").after('<li style="margin:10px 0px;border-bottom:1px dashed #ccc;"></li>'); 2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 3 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 4 <html xmlns="http://www.w3.org/1999/xhtml"> 5 <head> 6 <meta http-equiv="Content-Type"content="text/html; charset=utf-8"/> 7 <title>jQuery每隔10条加一条线</title> 8 <script language="JavaScript"src="jquery-1.7.2.min.js"></script> 9 <script language="JavaScript"type="text/JavaScript"> 10 $(document).ready(function(){ 11 $(".list2 li:nth-child(10n)").after('<li style="margin:10px 0px;border-bottom:1px dashed #ccc;"></li>'); 12 }); 13 </script> 14 </head> 15 <body> 16 <style> 17 li{ list-style-type: none;} 18 </style> 19 <ul class="list2"> 20 <li>001</li> 21 <li>002</li> 22 <li>003</li> 23 <li>004</li> 24 <li>005</li> 25 <li>006</li> 26 <li>007</li> 27 <li>008</li> 28 <li>009</li> 29 <li>010</li> 30 <li>011</li> 31 <li>012</li> 32 <li>013</li> 33 <li>014</li> 34 <li>015</li> 35 <li>016</li> 36 <li>017</li> 37 <li>018</li> 38 <li>019</li> 39 <li>020</li> 40 <li>021</li> 41 <li>022</li> 42 <li>023</li> 43 <li>024</li> 44 <li>025</li> 45 <li>026</li> 46 <li>027</li> 47 <li>028</li> 48 <li>029</li> 49 <li>030</li> 50 <li>031</li> 51 <li>032</li> 52 </ul> 53 </body> 54 </html>