code: function toHumanReadableSize(size, len) {
    if(!size) return '0B';
    if (!len || len <= 0) {
      len = 2;
    }
    var units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
    var i = Math.floor( Math.log(size) / Math.log(1024));
    return (size/Math.pow(1024, i)).toFixed(len) + units[i];
  }
docs: Convert the size to human readable size