不知道这个行不行:
<tr><td><span id="row1"></td></tr>
<tr><td><span id="row2"></td></tr>
<tr><td><span id="result"></td></tr>
<script language="javascript">
result.innerHTML=row1.innerHTML+row2.innerHTML;
</script>
<tr><td><span id="row1"></td></tr>
<tr><td><span id="row2"></td></tr>
<tr><td><span id="result"></td></tr>
<script language="javascript">
result.innerHTML=row1.innerHTML+row2.innerHTML;
</script>
http://community.csdn.net/expert/deeptree/RoomForum.asp?roomid=304
var table = window.document.getElementById("table1");
var i = 0;
var count = 0;
while (table.rows[i] != null) {
i = i + 1;
count = count + parseInt(table.rows[i].cell[i].innerText)
}
row = table.insertRow(i - 1);
var cell;
cell = row.insertCell();
cell.innerText = "" + count;
</script>