从Base64字符串下载的JavaScript文件在IE中不起作用

function downloadFileFromBase64(base64String, fileName) {
  var blob = base64ToBlob(base64String);
  var url = URL.createObjectURL(blob);
  
  var a = document.createElement('a');
  a.href = url;
  a.download = fileName;
  a.click();
  
  URL.revokeObjectURL(url);
}

function base64ToBlob(base64String) {
  var byteCharacters = atob(base64String);
  var byteArrays = [];
  
  for (var i = 0; i < byteCharacters.length; i++) {
    byteArrays.push(byteCharacters.charCodeAt(i));
  }
  
  var byteArray = new Uint8Array(byteArrays);
  
  return new Blob([byteArray], { type: 'application/javascript' });
}

function downloadFileFromBase64(base64String, fileName) {
  var dataURI = 'data:application/javascript;base64,' + base64String;
  
  var a = document.createElement('a');
  a.href = dataURI;
  a.download = fileName;
  a.click();
}

function downloadFileFromBase64(base64String, fileName) {
  var blob = base64ToBlob(base64String);
  saveAs(blob, fileName);
}

function base64ToBlob(base64String) {
  var byteCharacters = atob(base64String);
  var byteArrays = [];
  
  for (var i = 0; i < byteCharacters.length; i++) {
    byteArrays.push(byteCharacters.charCodeAt(i));
  }
  
  var byteArray = new Uint8Array(byteArrays);
  
  return new Blob([byteArray], { type: 'application/javascript' });
}