Addition of Two Number in Jquery

Open Notepad and write the following Code !!

<!DOCTYPE html>
<html lang="en-US">
<head>
    <title>HTML Tutorial</title>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
    <script>
        $(document).ready(function () {
            var a = parseInt($('#txt1').val(), 10);
            var b = parseInt($('#txt2').val(), 10);
            $("#submit").on("click", function () {
                var sum = a + b;
                alert(sum);
            })
        })
    </script>
</head>
<body>
    <h2>Addition of Two No in Jquery</h2>
    <label text="Enter 1st No"></label>
    <input type="text" id="txt1" name="option">
    <input type="text" id="txt2" name="task">

    <input id="submit" type="button" value="press me">
</body>

</html>

Output:

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