vue导出多个pdf或excel，打包成zip压缩包进行下载

1.有请求接口返回arraybuffer类型的数据（npm: jszip, file-saver）

const zip = new JSZip();
let promises = [];// 所有下载请求的数组集合
const getFile = url => { // 一个http get请求
  return new Promise((resolve, reject) => {
    Vue.http.get(url, {responseType: arraybuffer}).then(data => {
      resolve(data.data);
    }).catch(error => {
      reject(error.toString());
    });
  });
};

downloadData.forEach(item => {
  let promise;
  promise = getFile(`XXX/${item.id}/download`).then(data => {
    zip.file(`${item.name}.pdf`, data, {binary: true}); // 逐个添加文件，需要后缀名，pdf或xlsx都可
  });
  promises.push(promise);// 逐个添加请求
});

Promise.all(promises).then(async () => {
  await zip.generateAsync({ type: blob }).then(content => {
    // 生成二进制流
    FileSaver.saveAs(content, xxx.zip); // 利用file-saver保存文件  自定义文件名
  });
});

2.无接口请求 / 自己组装的数据转化为Excel表格（npm: xlsx, jszip, file-saver）

getCharCol (n) {
  let temCol = , s = , m = 0;
  while (n > 0) {
    m = n % 26 + 1;
    s = String.fromCharCode(m + 64) + s;
    n = (n - m) / 26;
  }
  return s;
}
for (let i = 0; i < this.selected.length; i ++) {
  /* 先得到目前下标的downloadData */
  var keys = Object.keys(downloadData[0]);
  var content = {};
  // 把json格式的数据转为excel的行列形式
  var sheetsData = downloadData.map(function (item, rowIndex) {
      return keys.map(function (key, columnIndex) {
          return Object.assign({}, {
              value: item[key],
              position: (columnIndex > 25 ? this.getCharCol(columnIndex) : String.fromCharCode(65 + columnIndex)) + (rowIndex + 1),
          });
      });
  }).reduce(function (prev, next) {
      return prev.concat(next);
  });

  sheetsData.forEach(function (item, index) {
      content[item.position] = { v: item.value };
  });
  var coordinate = Object.keys(content);
  var workBook = {
      SheetNames: [main],
      Sheets: {
          main: Object.assign({}, content, { !ref: coordinate[0] + : + coordinate[coordinate.length - 1] }),
      }
  };
  var excelData = XLSX.write(workBook, { bookType: xlsx, bookSST: false, type: binary });
  var blob = new Blob([this.string2ArrayBuffer(excelData)], { type:  });
  zip.file(`xxxx.xlsx`, blob, {binary: true});
}

await zip.generateAsync({type:blob}).then(function(content) {
  FileSaver.saveAs(content, xxx.zip);
});