如何在IE版本11中将base64字符串下载为pdf格式，同样适用于mozilla firefox

function base64ToBlob(base64String) {
  var byteCharacters = atob(base64String);
  var byteArrays = [];

  for (var offset = 0; offset < byteCharacters.length; offset += 512) {
    var slice = byteCharacters.slice(offset, offset + 512);

    var byteNumbers = new Array(slice.length);
    for (var i = 0; i < slice.length; i++) {
      byteNumbers[i] = slice.charCodeAt(i);
    }

    var byteArray = new Uint8Array(byteNumbers);
    byteArrays.push(byteArray);
  }

  var blob = new Blob(byteArrays, { type: 'application/pdf' });
  return blob;
}

function downloadPDF(blob, fileName) {
  var link = document.createElement('a');
  link.href = URL.createObjectURL(blob);
  link.download = fileName;
  link.click();
}

var base64String = "your_base64_string_here";
var fileName = "example.pdf";

var blob = base64ToBlob(base64String);
downloadPDF(blob, fileName);