Functions are one of the fundamental building blocks in JavaScript. A function is a JavaScript procedure—a set of statements that performs a task or calculates a value.
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<script>
function add(n1,n2)
{
var sum = parseInt(n1)+parseInt(n2);
alert(sum);
}
</script>
<input type="button" value="Claculate Sum" onclick="add(12,13)">
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