      }

    } );

    $( "#enable" ).click( function () {

        // data can be add after init() function be called, after add new data, the system will be automatically updated

        controller.addData(data);

    } );

    $( "#disable" ).click( function () {

        // can use clearData API to clear data in globe

        controller.clearData();

    } );

</script>

</body>
</html>