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Demo

Code

<html>

<head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
    <script>
        $(document).ready(function() {
            $("#btn").click(function() {
                console.log("after click the button");
                var age = $("#age").val();
                console.log("selct age is" + age);

                if (age < 0) {
                    $("#result").html("check your age");
                    return;
                }
                var output = '';

                if (age >= 0 && age < 10) {
                    output = 'infant'
                } else if (age >= 11 && age <= 17) {
                    output = 'minor'
                } else if (age >= 18 && age <= 50) {
                    output = 'major'
                } else {
                    output = 'adult'
                }
                $("#result").html(output);
            });
        });
    </script>
</head>

<body>
    Enter age :
    <input type="text" name="number" id="age"> </input><br><br>
    <button id="btn"> Submit </button>
    <p id="result"></p>
</body>

</html>



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