后端返回文件流

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记得请求时加上
method: “get”,
responseType:‘blob’, // 这里很重要

把拿到的流传进下面的方法

function downloadFile(obj, name, suffix) {
  const url = window.URL.createObjectURL(new Blob([obj]));
  const link = document.createElement("a");
  link.style.display = "none";
  link.href = url;
  const fileName = parseTime(new Date()) + "-" + name + "." + suffix;
  link.setAttribute("download", fileName);
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
}