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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://cdn.static.w3big.com/libs/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("ul.test li").css("border", "4px double"); }); </script> </head> <body> <ul class="test"> <li>列表项</li> <li>列表项 <ul> <li>内嵌列表项</li> </ul> </li> <li>列表项</li> </ul> </body> </html>