51help TIY
码：
<!DOCTYPE html> <html> <head> <script type="text/javascript" src="../jquery/jquery.js" tppabs="http://www.51help.tk/jquery/jquery.js"></script> </head> <body> <div><span>Hello</span></div> <p class="selected">Hello Again</p> <p>And Again</p> <script> $("p").prev(".selected").css("background", "yellow"); </script> </body> </html>
查看结果: