When I try and use the save() function for jsPDF it's throwing the following error:

ReferenceError: saveAs is not defined

I'm just trying a very simple example:

var doc = new jsPDF();

doc.text(20, 20, 'Hello world!');

doc.text(20, 30, 'This is client-side Javascript, pumping out a PDF.');

doc.addPage();

doc.text(20, 20, 'Do you like that?');



doc.save('test.pdf');

Anyone have any ideas what's wrong?