W3School TIY
编辑您的代码：
<!DOCTYPE html> <html> <head> <style> .full { border: 1px solid red; } </style> <script type="text/javascript" src="../jquery/jquery.js"></script> </head> <body> <ul> <li>list item 1</li> <li>list item 2 <ul> <li>list item 2-a</li> <li>list item 2-b</li> </ul> </li> <li>list item 3</li> <li>list item 4</li> </ul> <script> $('li').has('ul').css('background-color', 'red'); </script> </body> </html>
查看结果: