npm安装js-xlsx

导入XLSX

import XLSX from "xlsx";
var aoa = [
    ['主要信息', null, null, '其它信息'], // 特别注意合并的地方后面预留2个null
    ['姓名', '性别', '年龄', '注册时间'],
    ['张三', '男', 18, new Date()],
    ['李四', '女', 22, new Date()]
];
var sheet = XLSX.utils.aoa_to_sheet(aoa);
sheet['!merges'] = [
    // 设置A1-C1的单元格合并
    {s: {r: 0, c: 0}, e: {r: 0, c: 2}}
];
openDownloadDialog(sheet2blob(sheet), '单元格合并示例.xlsx');

openDownloadDialog(url, saveName)
    {
    if(typeof url == 'object' && url instanceof Blob)
    {
      url = URL.createObjectURL(url); // 创建blob地址
    }
    var aLink = document.createElement('a');
    aLink.href = url;
    aLink.download = saveName || ''; // HTML5新增的属性，指定保存文件名，可以不要后缀，注意，file:///模式下不会生效
    var event;
    if(window.MouseEvent) event = new MouseEvent('click');
    else
    {
      event = document.createEvent('MouseEvents');
      event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
    }
    aLink.dispatchEvent(event);
  },
  sheet2blob(sheet, sheetName) {
      sheetName = sheetName || 'sheet1';
      var workbook = {
          SheetNames: [sheetName],
          Sheets: {}
      };
      workbook.Sheets[sheetName] = sheet;
      // 生成excel的配置项
      var wopts = {
          bookType: 'xlsx', // 要生成的文件类型
          bookSST: false, // 是否生成Shared String Table，官方解释是，如果开启生成速度会下降，但在低版本IOS设备上有更好的兼容性
          type: 'binary'
      };
      var wbout = XLSX.write(workbook, wopts);
      var blob = new Blob([s2ab(wbout)], {type:"application/octet-stream"});
      // 字符串转ArrayBuffer
      function s2ab(s) {
          var buf = new ArrayBuffer(s.length);
          var view = new Uint8Array(buf);
          for (var i=0; i!=s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
          return buf;
      }
      return blob;
  },