how to send document to printer using javascript code example

Example: print pdf javascript

// a javascript library for easily printing files from your page
// https://printjs.crabbly.com/
// add in the html head area
<script src="https://printjs-4de6.kxcdn.com/print.min.js"></script>
<script src="https://printjs-4de6.kxcdn.com/print.min.css"></script>

// add in your javaScript
function myPrint(){
  printJS('myFile.pdf');
}
$('#printBtn').click(myPrint);