canvasdownload.js

  download= function() {
    canvas=document.getElementById('canvas')
      canvas.toBlob(function(blob) {
        var anchor = document.createElement('a'),
            dataUrl  = URL.createObjectURL(blob),
            fileName = 'canvas.png';

        // set a attributes
        anchor.setAttribute('href', dataUrl);
        anchor.setAttribute('target', '_blank');
        anchor.setAttribute('download', fileName);

        // simulate click
        if (document.createEvent) {
          evtObj = document.createEvent('MouseEvents');
          evtObj.initEvent('click', true, true);
          anchor.dispatchEvent(evtObj);
        }
        else if (anchor.click) {
          anchor.click();
        }
      });
      }

Download Text file using

 function download(text, filename, type) {
    file = new Blob([Object.values(PAGES).join('')], {type: type})
    var a = document.createElement("a"),
          url = URL.createObjectURL(file);
        a.href = url;
        a.download = filename;
        document.body.appendChild(a);
        a.click();
        setTimeout(function() {
            document.body.removeChild(a);
            window.URL.revokeObjectURL(url);  
        }, 0); 
}


download(Object.values(PAGES).join(''), 'v2codes.txt', 'text/plain')