使用JavaScript实现表格添加行

<script language="javascript">
<!--
     var objtbl = document.all.tblTable;
    function addRow(objEle)
    {
        if (objEle.value == "增加")
  { alert(objtbl.rows.length);
            Common(objtbl.rows.length);
   }
        else
        {//入
            var ele = objEle.parentElement.parentElement;
   alert(ele.rowIndex);
            Common(ele.rowIndex);
        }
    }
   
    function deleteRow(btn)
    {
        var row = btn.parentElement.parentElement;
        objtbl.deleteRow(row.rowIndex);
    }
   
    function Common(rowIndex)
    {
        try
        {
            var str = "";
            var newRow = objtbl.insertRow(rowIndex);
            var newCell = newRow.cells;
   alert(newCell.length);
            var cell = newRow.insertCell(newCell.length);
            cell.innerText = "杨绍杰";

   alert(newCell.length);
            cell = newRow.insertCell(newCell.length);
            cell.align = "left"
            cell.innerHTML = "<input type=/"text/" name=/"txtSex/" value=/"男/" size=/"10/">";

            cell = newRow.insertCell(newCell.length);
            cell.innerHTML = "<input type=/"text/" name=/"txtAddress/" value=/"河南新乡/" size=/"10/">";
            cell.align = "center";

            cell = newRow.insertCell(newCell.length);
            cell.innerHTML = "<input type=/"text/" name=/"txtScholl/" value=/"河南洛阳/" size=/"10/">";
            cell.align = "right";

            cell = newRow.insertCell(newCell.length);
            cell.align = "center";
            str = "<input type=/"button/" onclick=/"javascript:deleteRow(this)/" value=/"删除/">  ";
            str +="<input type=/"button/" onclick=/"javascript:addRow(this)/" value=/"插入/">";
            cell.innerHTML = str;
        }
        catch(e){}
    }
//-->
</script>