<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ alert($("p").css("color")); });});</script></head><body><button>Return CSS color value of p element</button><p style="color:red">This is a paragraph.</p></body></html>