[bes]

Требует доработки, использовать не рекомендуется

<style>
	td {
		border: solid 1px;
		width: 200px;
		cursor: pointer;
		
	}
	table {
		border: solid 1px;
	}
</style>

<table id="table">
	<tr>
		<td>1</td>
		<td>2</td>
		<td>3</td>
	</tr>
	</table>
	
<script>
window.onload =function () {
	var table = document.getElementById('table');
	table.onclick = function (e) {
		e = e || event;
		var target = e.target || e.srcElement;
		if (target.parentNode.tagName == 'TR') {
			alert(target.innerHTML);
		} else if (target.tagName == 'TABLE') {
			var x = e.clientX;
			var y = e.clientY;
			while (target.parentNode.tagName != 'TR') {
				x++;
				y++;
				target = document.elementFromPoint(x, y);
				if (target.parentNode.tagName == 'TR') {
					alert(target.innerHTML);
					break;
				} else if (target.tagName != 'TABLE') {
					alert('ha');
					break;
				}
			}
		}
	}
}
</script>