js后端返回的数据是blob类型的excel下载文件

注：ajax中加responseType: "blob"

if (res && res.status === 200) {
  const filename = "对账表.xlsx";
  const blob = new Blob([res.data]);
  const link = document.createElement("a");
  link.style.display = "none";
  link.href = URL.createObjectURL(blob);
  link.setAttribute("download", filename);
  document.documentElement.appendChild(link);
  link.click();
  document.documentElement.removeChild(link);
} else {
  let content = res.data; //arraybuffer类型数据
  let resBlob = new Blob([content]);
  let reader = new FileReader();
  reader.readAsText(resBlob, "utf-8");
  reader.onload = () => {
	_this.$message.error(reader.result);
  };
}