<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>ГГ</title>
</head>
<body>
<table>
<tbody>
<tr>
<td id="tdval1">123</td>
</tr>
</tbody>
</table>
<input id="inpval1" type="text">
<script>
var val = document.querySelector('#tdval1').innerHTML;
document.querySelector('#inpval1').value = val;
</script>
</body>
</html>