es6 class

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title></title>
    </head>
    <body>
        <script src="js/browser.min.js" type="text/javascript" charset="utf-8"></script>
        <script type="text/javascript">
            class Calc {
                constructor(){
                    console.log('Calc constructor');
                }
                add(a , b){
                    return a + b;
                }
            }

            var c = new Calc();
            console.log(c.add(4,5));
        </script>
    </body>
</html>
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