<html><head><script type="text/javascript" src="/jquery/jquery.js"></script><script type="text/javascript">$(document).ready(function(){ $("button").click(function(){ alert($("p").css("color")); });});</script></head><body><p style="color:red">This is a paragraph.</p><button type="button">返回段落的颜色</button></body></html>