mardi 30 juin 2020

i don't know how to use ' NaN ' in javascript's if command

Hi guys i know this code is too easy but i'm new in javascript and i'm still learning it . this code gets a value from user then shows an answer but it dosen't matter if value is number or not it just says = its a number .

<!DOCTYPE html>
<html>
    <head>
    </head>
    <body>
        <!--Javascript starts-->
    <script>
        var age = prompt("How old are you ?","18");
           if(age == NaN)
           {
               alert("its not a number");
           }else
           {
               alert("its a number");
           }  
    </script>
        <!--End of Javascript-->

    </body>
</html>

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