javascript - Check if variable holds File or Blob -

javascript has both file , blob file representation, , both same thing. there way check if variable holding file or blob type of data?

w3.org:

'a file object blob object name attribute, string;'

in case of file:

var d = new date(2013, 12, 5, 16, 23, 45, 600); var generatedfile = new file(["rough draft ...."], "draft1.txt", {type: 'text/plain', lastmodified: d});  console.log(typeof generatedfile.name == 'string'); // true 

in case of blob:

var blob = new blob(); console.log(typeof blob.name); // undefined 

condition:

var isfile = typeof fileorblob.name == 'string';