问如何使用pdf.js

EN

/* create the PDF document */

var doc = new pdf();
doc.text(20, 20, 'hello, I am PDF.');
doc.text(20, 30, 'i was created in the browser using javascript.');
doc.text(20, 40, 'i can also be created from node.js');

/* Optional - set properties on the document */
doc.setProperties({
  title: 'A sample document created by pdf.js',
  subject: 'PDFs are kinda cool, i guess',        
  author: 'Marak Squires',
  keywords: 'pdf.js, javascript, Marak, Marak Squires',
  creator: 'pdf.js'
});

doc.addPage();
doc.setFontSize(22);
doc.text(20, 20, 'This is a title');
doc.setFontSize(16); 
doc.text(20, 30, 'This is some normal sized text underneath.');

var fileName = "testFile"+new Date().getSeconds()+".pdf";
var pdfAsDataURI = doc.output('datauri', {"fileName":fileName});