Blob()

The Blob() constructor returns a new Blob object. The content of the blob consists of the concatenation of the values given in the parameter array.

Syntax

var aBlob = new Blob( array, options );

Parameters

• array is an Array of ArrayBuffer, ArrayBufferView, Blob, DOMString objects, or a mix of any of such objects, that will be put inside the Blob. DOMStrings are encoded as UTF-8.
• options is an optional BlobPropertyBag dictionary which may specify the following two attributes:
  • type, with a default value of "", that represents the MIME type of the content of the array that will be put in the blob.
  • endings, with a default value of "transparent", that specifies how strings containing the line ending character \n are to be written out. It is one of the two values: "native", meaning that line ending characters are changed to match host OS filesystem convention, or "transparent", meaning that endings are stored in the blob without change.

Example

var aFileParts = ['<a id="a"><b id="b">hey!</b></a>']; // an array consisting of a single DOMString
var oMyBlob = new Blob(aFileParts, {type : 'text/html'}); // the blob

Specification

Browser compatibility

[1] Before Firefox 16, the second parameter, when set to null or undefined, leads to an error instead of being handled as an empty dictionary.

See also

• The deprecated BlobBuilder which this constructor replaces.