JS动态行列 、获取select自定义属性

<script language="javascript" type="text/javascript">
<!--

function addnewline()
 {
   var row,cell,cell2;
  row = document.getElementById("estimateslist").insertRow(-1);
  if(row != null ){
   cell = row.insertCell(0);
   cell.innerHTML="<input type=\"text\" name=\"item\">";
   cell2 = row.insertCell(1);
   cell2.innerHTML="<input type=\"text\" name=\"timer\" value='--'><input type=\"button\" value=\"delete\" onclick='deleteitem(this)'>";
  }
 }
 
 function deleteitem(obj){
  var rowNum,curRow;
  curRow = obj.parentNode.parentNode;
  rowNum = document.getElementById("estimateslist").rows.length - 1;
  document.getElementById("estimateslist").deleteRow(curRow.rowIndex);
 }

    -->
</script>

<table width="100%" border="0" id="estimateslist">
      <tr>
        <td width="150">item </td>
        <td>time required</td>
        </tr>
      <tr>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        </tr>
     
    </table>

<input type="button" name="button4" id="button4" value="add new line" onClick="addnewline()">

2.

obj.options[obj.selectedIndex].getAttribute("属性名")