selenium By.xpath 用法



点击页面上的File菜单， 用selenium怎么抓多层DIV里的路径:

 代码大概形式   div嵌套了10层
<div id="isc_2M">
      ...（中间省略8个div）
         <div id="ISC_2O">
             <table>
               <tbody>
                    <tr>
<td>
                          <table>
                             <tbody>
                                <tr>
                                   <td>File
                                   </td>
                                </tr>
                             </tbody>
                          </table>
                       </td>
                    </tr>
               </tbody>
             <table>
         </div>
      ...
</div>

需要点击<td>File</td>这个

这个:
1 selenium.click("//td[text()='File']");
2 selenium.click("//td[contains(text(),‘File’)]");
3 selenium.click("//div/table/tbody/tr[1]/td[1]/table/tbody/tr[1]/td[1]");

4 selenium.click("//div[@id='ISC_2O']/table//table//tr[1]/td");