<table id="tab"> <tr> <td colspan="3"></td><td colspan="2"></td> </tr> </table> <script> var t=document.getElementById("tab"); var r = t.rows(0); var c = r.cells; var col = 0; for(var i=0;i<c.length;i++){ col += c[i].colSpan; } alert("共有"+col+"列!"); </script>
document.getElementById("tableID").rows[0].cells.length;//
<tr>
<td colspan="3"></td><td colspan="2"></td>
</tr>
</table>
<script>
var t=document.getElementById("tab");
var r = t.rows(0);
var c = r.cells;
var col = 0;
for(var i=0;i<c.length;i++){
col += c[i].colSpan;
}
alert("共有"+col+"列!");
</script>