文件流导出文件

// 下载excel
export const downloadFile = (fileStream, fileName) => {
  if (window.navigator.msSaveBlob) {
    try {
      window.navigator.msSaveBlob(fileStream, fileName);
    } catch (e) {
      console.log(e);
    }
  } else {
    const url = window.URL || window.webkitURL;
    const bUrl = url.createObjectURL(fileStream);
    let a = document.createElement("a");
    a.style.display = "none";
    a.href = bUrl;
    a.download = decodeURIComponent(fileName);
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    url.revokeObjectURL(bUrl);
  }
};

使用downloadFile(res, `默认文件.xlsx`);

res是后端返回文件流，默认文件.xlsx是文件名 .xlsx是后缀名

// 获取文件类型
export function getFileType(file) {
  const type = file.type || "";
  const name = file.name || "";
  if (type.includes("word")) {
    return "doc";
  } else if (type.includes("excel") || type.includes("spreadsheetml.sheet")) {
    return "excel";
  } else if (type === "text/plain") {
    return "txt";
  } else if (type === "application/pdf") {
    return "pdf";
  } else if (type === "text/html") {
    return "html";
  } else if (type === "text/markdown" || name.includes(".md")) {
    return "md";
  } else {
    return "other";
  }
}