DDim1000,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
</head>
<body>
<table width="400" class="MyTab" >
<thead>
<tr>
<th>Title 1</th>
<th>Title 2</th>
<th>Title 3</th>
</tr>
</thead>
<tbody>
<tr>
<td>Cell 1.1</td>
<td>Cell 1.2</td>
<td>Cell 1.3</td>
</tr>
<tr>
<td>Cell 2.1</td>
<td>Cell 2.2</td>
<td>Cell 2.3</td>
</tr>
</tbody>
</table>
<script>
var tch = document.querySelectorAll(".MyTab tbody tr");
tch[0].querySelectorAll('td').forEach(function(_, i) {
tch.forEach(function(tr) {
alert(tr.cells[i].textContent)
});
});
</script>
</body>
</html>