5-variable_and_constant.html

<!doctype>
<html>
<head>
    <meta name= "variable and constant" content ="">
    <meta charset = "utf-8">
    <title>variable and constant </title>
    <script>
            var mes;
            mes = "";
            mes = "hello world";
            alert(mes);
            console.log(mes);
            mes = "addition";
            alert(mes + 10);
            console.log(mes);
            var count = 1;
            alert(count * 2);
            console.log(mes);


    </script>

</head>
<body>
   
</body>
        <script>
            document.write("writing" + (count + 10));

        </script>>


    </html>