function handleExport(data) {
  // 动态创建iframe下载文件
  let fileName = this.selectedTabelRow[0].dirName;
  if (!data) {
    return;
  }
  let blob = new Blob([data], { type: "application/octet-stream" });
  if ("download" in document.createElement("a")) {
    // 不是IE浏览器
    let url = window.URL.createObjectURL(blob);
    let 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); // 下载完成移除元素
    window.URL.revokeObjectURL(url); // 释放掉blob对象
  } else {
    // IE 10+
    window.navigator.msSaveBlob(blob, fileName);
  }
}