$('.testfile').change(function(ev) {
        var target = ev.currentTarget ;
        var file = target.files[0] ;
        
        $.r_thumbnail(file, {
            type: "image",
            withData: true
        }, function(resp) {
console.log(resp) ;
/*
{
    file; file
    type: image
    thumbnail: thumbnail
    data: 
    {  //music
        width
        height
        duration
        year
        album
        artist
        genre
    },
    {  //photo
        width
        height
    },
    {  //video
        width
        height
        duration
    },
}
*/
            $('body').append(resp.thumbnail) ;
        })
    }) ;
    
}) ;