odd-even.html

<html>
    <head>
        
    </head>
    <body>
        <center>
        <input type="number" id="num">
        <button onclick="check()">check</button>
    </center>
    </body>
    <style>
        body{
            margin:130px;
        }
    </style>
    <script>
    function check()
    {
        var a =document.getElementById("num").value
        if(a%2==0)
        alert("even")
        else {
            alert("odd")
        }
    }
    </script>
</html>