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function addRow()
  {
     var root = document.getElementById("tbody")
     var allRows = root.getElementsByTagName('tr');
     var allCells = allRows[0].getElementsByTagName('td');
     var newRow = root.insertRow();
     var newCell0 = newRow.insertCell();
     var newCell1 = newRow.insertCell();
     var newCell2 = newRow.insertCell();
     var newCell3 = newRow.insertCell();
     newCell0.innerHTML = allCells[0].innerHTML;
     newCell1.innerHTML = allCells[1].innerHTML;
     newCell2.innerHTML = allCells[2].innerHTML;
     newCell3.innerHTML = allCells[3].innerHTML;
  }
  function removeRow(r)
  {
    var root = r.parentNode;
    root.deleteRow(r);
  }
HTML´úÂ룺
<table>
  <tbody id="tbody">
    <tr>
        <td><select><option>hello</option><option>hi</option></select></td>
        <td><input type="text" value="enter you name here" /></td>
        <td><input type="text" value="text2"/></td>
        <td&g


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