文件下载 数据流方法

/**
 * get blob 下载文件方法
 * @param  {Number} time
 * @return {String}
 * @returns {Object} {time: Number, unit: any}
 */
export function getDownload(value: any, defaultFileName: string, type: string) {
  const disposition = value.headers?.['content-disposition'];
  let fileName = defaultFileName;
  if (disposition) {
    const reg = /filename=(.*)/;
    fileName = decodeURI(reg.exec(disposition)[1].trim());
  }
  const blob = new Blob([value.data], { type: type });
  const url = window.URL.createObjectURL(blob);
  const link = document.createElement('a');
  link.style.display = 'none';
  link.href = url;

  link.setAttribute('download', fileName);
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
  window.URL.revokeObjectURL(url);
}