jQuery实例之五：class的操作

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下面的实例是建立一个表格，对class进行动态操作效果如图所示：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head>   <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />   <title>表格</title>   <script src="jquery.js" type="text/javascript"></script>   <script type="text/javascript">    $(document).ready(function(){     $("#table tr").mouseover(function(){      $(this).addClass("over");     });     $("#table tr").mouseout(function(){      $(this).removeClass("over");     });         $("#table tr:even").addClass("double");    });function removeEvenTdClass(){ $("#table tr:even").removeClass();}   </script>   <style type="text/css">th{background: gray;color: white;}table{width: 30em;height: 10em;}td {border-bottom:1px solid #95bce2;text-align:center;}tr.over td{font-weight: bold;}tr.double td{background: #DAF3F1;}   </style></head><body>   <table id="table" border="0" cellpadding="0" cellspacing="0">    <tr>     <th>姓名</th>     <th>年龄</th>     <th>籍贯</th>     <th>手机</th>    </tr>    <tr>     <td>nlcold</td>     <td>33</td>     <td>湖南</td>     <td>15988888888</td>    </tr>    <tr>     <td>nlcold</td>     <td>33</td>     <td>湖南</td>     <td>15988888888</td>    </tr>    <tr>     <td>nlcold</td>     <td>33</td>     <td>湖南</td>     <td>15988888888</td>    </tr>    <tr>     <td>nlcold</td>     <td>33</td>     <td>湖南</td>     <td>15988888888</td>    </tr>    <tr>     <td>nlcold</td>     <td>33</td>     <td>湖南</td>     <td>15988888888</td>    </tr>    <tr>     <td>nlcold</td>     <td>33</td>     <td>湖南</td>     <td>15988888888</td>    </tr>    <tr>     <td>nlcold</td>     <td>33</td>     <td>湖南</td>     <td>15988888888</td>    </tr>    <tr>     <td>nlcold</td>     <td>33</td>     <td>湖南</td>     <td>15988888888</td>    </tr>    <tr>     <td>nlcold</td>     <td>33</td>     <td>湖南</td>     <td>15988888888</td>    </tr>   </table>    <input  id="btnRemoveClass" name="btnRemoveClass" type="button" value="removeEvenTdClass" onclick="removeEvenTdClass()"/></body></html>