How to use Blob in safari 5.1

Do safari browser for windows (version 5.1) support Blob?

The following sample code returns an error in console:

var array=[1,2];
var aBlob = new Blob( array);

Error:

"'[object BlobConstructor]' is not a constructor (evaluating 'new Blob( array)')"

How to fix this,If safari didn't support blob then how to replace this