function( file ) {
                if ( !(file instanceof WUFile) ) {
    
                    if ( !(file instanceof File) ) {
                        if ( !this._ruid ) {
                            throw new Error('Can\'t add external files.');
                        }
                        file = new File( this._ruid, file );
                    }
    
                    file = new WUFile( file );
                }
    
                return file;
            }
function( file ) {
                if ( !(file instanceof WUFile) ) {
    
                    if ( !(file instanceof File) ) {
                        if ( !this._ruid ) {
                            throw new Error('Can\'t add external files.');
                        }
                        file = new File( this._ruid, file );
                    }
    
                    file = new WUFile( file );
                }
    
                return file;
            }
function ( file ) { if ( ! ( file instanceof WUFile ) ) { if ( ! ( file instanceof File ) ) { if ( ! this . _ruid ) { throw new Error ( 'Can\'t add external files.' ) ; } file = new File ( this . _ruid , file ) ; } file = new WUFile ( file ) ; } return file ; }
为了支持外部直接添加一个原生File对象。
为了支持外部直接添加一个原生File对象。
Add external files to the file system.