When we receive the input field's value in Javascript. Its data type is 'string' even if the value of type attribute number <input type="number">.
So its type can be easily changed from string to number by using Javascript predefined Number() method.
EXAMPLE: Use of Number Method
<html>
<body>
<input type="number" id="first-n" />
<input type="number" id="second-n" />
<button onclick="calculate()">Calculate</button>
<script>
function calculate()
{
var first=Number(document.getElementById("first-n").value);
var second=Number(document.getElementById("second-n").value);
alert(first+second);
}
</script>
</body>
</html>
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