open base64 pdf array

HTML

<script src="//mozilla.github.io/pdf.js/build/pdf.js"></script>

<button id="btnTest">Click me</button>

JavaScript

$(document).ready(function () {
	$('#btnTest').click(function(){
  go();
  });
  });

function _base64ToArrayBuffer(base64) {
    var binary_string = window.atob(base64);
    var len = binary_string.length;
    var bytes = new Uint8Array(len);
    for (var i = 0; i < len; i++) {
        bytes[i] = binary_string.charCodeAt(i);
    }
    return bytes.buffer;
}


function go()  {
	var data = byteData ; 
//	console.log(data); 
	var pdfData = _base64ToArrayBuffer(data);
  console.log(pdfData)
	var file = new Blob([pdfData], {type:'application/pdf'});
	var fileUrl = URL.createObjectURL(file);

     //open it via a link
    var fileName = "test.pdf";
    var a = document.createElement("a");
    document.body.appendChild(a);
    a.href = fileUrl;
    a.download = fileName;
    a.click();
    //open it directly 
    window.open(fileUrl);
   
}



const  byteData =...