js2(RSST)

<!DOCTYPE html>
<html>
<head>
	<title>RSST</title>
</head>
<body>
	<table>
		<tr>
			<td>Number 1 </td>
			<td><input type="text" name="number" id="n1"></td>
		</tr>
		<tr>
			<td>Number 2 </td>
			<td><input type="text" name="number" id="n2"></td>
		</tr>
		<tr>
			<td><button onclick="sum()">Sum</button></td>
			<td></td>
		</tr>
		<tr>
			<td><p id="show"></p></td>
			<td></td>
		</tr>

	</table>


	<script type="text/javascript">


		function sum(){
		var a = document.getElementById("n1").value;
		var b = document.getElementById("n2").value;
		var a1 = Number(a);
		var b1 = Number(b);
		var c = a1 + b1;
		var d = a1 + " + " + b1 + " = " + c;
		document.getElementById('show').innerHTML = d;
		}

	</script>

</body>
</html>