var result = element.result; element.result = value;
The format of the
result data depends on which of the read methods was used to initiate the read operation. This property can also return partial Blob data. Partial Blob data is the part of the File or Blob that has been read into memory currently; when processing the read method readAsText, partial Blob data is a Document Object Model (DOM) string that is incremented as more bytes are loaded; and when processing readAsArrayBuffer, partial Blob data is an array buffer object consisting of the bytes loaded so far.
Microsoft Developer Network: [Windows Internet Explorer API reference Article]