如何动态选择动态添加的select / option标签选项

HTML code:

HTML代码：

<table id="test">
     <thead>
         <tr>
             <th>col1</th>
             <th>col2</th>
             <th>col3 </th>
         </tr>
     </thead>
     <tbody id="test1">
     </tbody>
  </table>
<table id="test">
     <