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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://cdn.static.w3big.com/libs/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("p").add(document.getElementsByTagName("span")[0]).css("background-color","yellow"); }); </script> </head> <body> <h1>欢迎</h1> <p>一个P元素。</p> <p>另一个P元素。</p> <span>一个span元素。</span> <span>一个span元素。</span><br><br> <div>本示例为第一个span元素(下标0),添加与现有的P元素相同的CSS样式。</div> </body> </html>