51help TIY
码：
<!DOCTYPE html> <html> <head> <script src="../../ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" tppabs="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("p").css("background-color","yellow"); }); }); </script> </head> <body> <h2>这是标题</h2> <p style="background-color:#ff0000">落。</p> <p style="background-color:#00ff00">落。</p> <p style="background-color:#0000ff">落。</p> <p>落。</p> <button>设置 p 色</button> </body> </html>
查看结果: