Convert Data URI to JS blob - Javascript

gistfile1.js

dataURItoBlob = function(dataURI) {
      var array, binary, i;
      binary = atob(dataURI.split(",")[1]);
      array = [];
      i = 0;
      while (i < binary.length) {
        array.push(binary.charCodeAt(i));
        i++;
      }
      return new Blob([new Uint8Array(array)], {
        type: "image/jpeg"
      });
    };

Very nice work!
And I'd like to add some snippet here.

...
var mimeType = dataURI.match( /(:)([a-z\/]+)(;)/ )[2] ;
...
return new Blob([new Uint8Array(array)], {
    type: mimeType
});