ejercicio_funciones

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=<device-width>, initial-scale=1.0">
    <title>Probando JavaScript</title>
    <style>
        table,th,td,tr {
            border: 1px solid black;
            border-collapse: collapse;
        }
    </style>
</head>
<body>

    <table>
        <thead>
            <tr>
                <td>Tabla del 2</td>
            </tr>
        </thead>
        <tbody id="tabla"></tbody>
    </table>



    <script>
        var salida = "";
        for (var i=2; i<11; i+=2)
            for (var j=0; j<11; j++){
                salida = salida + "<tr>" + "<td id=" + i + "x" + j + ">" + producto(i,j) + "</td></tr>";
            }

        document.getElementById("tabla").innerHTML = salida;

        function producto(i,j){
            return i + " x " + j + " = " + i*j ;
        }

    </script>

</body>
</html>