code: function fileSizeGet()
    {
  
      debugger;
      let request = new XMLHttpRequest();
      request.open( 'HEAD', o.filePath, !o.sync );
      request.onreadystatechange = function( e )
      {
  
        if( this.status !== 200 )
        {
          return errorGive( '#' + this.status + ' : ' + this.statusText );
        }
  
        if( this.readyState == this.DONE )
        {
          let size = parseInt( request.getResponseHeader( 'Content-Length' ) );
          result.size = size;
          if( con )
          con.take( result );
        }
      }
      request.send();
    }
docs: /*