鼠标划过时整行变色

</p> <table border="1" width="400"> <tr bgColor="#111111"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#222222"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#333333"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#444444"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#555555"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#666666"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#777777"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#888888"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#999999"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#aaaaaa"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#bbbbbb"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#cccccc"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#dddddd"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#eeeeee"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgColor="#ffffff"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> </table> <p>
[Ctrl+A 全选 注:引入外部Js需再刷新一下页面才能执行]