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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>runoops自学教程(runoops.com)</title> <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("tr:lt(4)").css("background-color", "yellow"); }); </script> </head> <body> <h1>欢迎来到我的主页</h1> <table border="1"> <tr> <th>序号</th> <th>站点名</th> <th>网址</th> </tr> <tr> <td>1</td> <td>Google</td> <td>google.com</td> </tr> <tr> <td>2</td> <td>Runoops</td> <td>runoops.com</td> </tr> <tr> <td>3</td> <td>Taobao</td> <td>taobao.com</td> </tr> <tr> <td>4</td> <td>Baidu</td> <td>baidu.com</td> </tr> <tr> <td>5</td> <td>Sina</td> <td>sina.com.cn</td> </tr> <tr> <td>6</td> <td>Facebook</td> <td>facebook.com</td> </tr> <tr> <td>7</td> <td>twitter</td> <td>twitter.com</td> </tr> <tr> <td>8</td> <td>youtube</td> <td>youtube.com</td> </tr> </table> </body> </html>
运行结果：