JS自动添加删除行

<script language="javascript">
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();
    newCell0.innerHTML = allCells[0].innerHTML;
    newCell1.innerHTML = allCells[1].innerHTML;
}
function removeRow(r)
{
   var root = r.parentNode;
   root.deleteRow(r);
}
</script>

<html>
<body>
<table>
<tr>
<td>
<input type="button" onclick="addRow()" name="Submit" value="添加">
</td>
</tr>
<tbody id="tbody">
<tr>
<td><input name="jcsj" type="text"/></td> 
<td><input type="button" value="删除" onclick="removeRow(this.parentNode.parentNode)"/></td>
</tr>
</tbody>
</table>
</body>
</html>

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