npm install --save xlsx file-saver

https://github.com/SheetJS/js-xlsx
https://github.com/eligrey/FileSaver.js

import FileSaver from 'file-saver'
import XLSX from 'xlsx'

exportExcel () {
    /* generate workbook object from table */
    var wb = XLSX.utils.table_to_book(document.querySelector('#out-table'))
    /* get binary string as output */
    var wbout = XLSX.write(wb, { bookType: 'xlsx', bookSST: true, type: 'array' })
    try {
        FileSaver.saveAs(new Blob([wbout], { type: 'application/octet-stream' }), 'sheetjs.xlsx')
    } catch (e) { if (typeof console !== 'undefined') console.log(e, wbout) }
    return wbout
}

<!--  ECMAScript 5 兼容性  -->
<script type="text/javascript" src="https://unpkg.com/xlsx/dist/shim.min.js"></script>
<script type="text/vbscript" language="vbscript">
IE_GetProfileAndPath_Key = "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders"
Function IE_GetProfileAndPath(key): Set wshell = CreateObject("WScript.Shell"): IE_GetProfileAndPath = wshell.RegRead(IE_GetProfileAndPath_Key & key): IE_GetProfileAndPath = wshell.ExpandEnvironmentStrings("%USERPROFILE%") & "!" & IE_GetProfileAndPath: End Function
Function IE_SaveFile_Impl(FileName, payload): Dim data, plen, i, bit: data = CStr(payload): plen = Len(data): Set fso = CreateObject("Scripting.FileSystemObject"): fso.CreateTextFile FileName, True: Set f = fso.GetFile(FileName): Set stream = f.OpenAsTextStream(2, 0): For i = 1 To plen Step 3: bit = Mid(data, i, 2): stream.write Chr(CLng("&h" & bit)): Next: stream.Close: IE_SaveFile_Impl = True: End Function
</script>
<script type="text/vbscript" language="vbscript">
Function IE_LoadFile_Impl(FileName): Dim out(), plen, i, cc: Set fso = CreateObject("Scripting.FileSystemObject"): Set f = fso.GetFile(FileName): Set stream = f.OpenAsTextStream(1, 0): plen = f.Size: ReDim out(plen): For i = 1 To plen Step 1: cc = Hex(Asc(stream.read(1))): If Len(cc) < 2 Then: cc = "0" & cc: End If: out(i) = cc: Next: IE_LoadFile_Impl = Join(out,""): End Function
</script>
<script type="text/javascript" src="https://unpkg.com/xlsx/dist/xlsx.full.min.js"></script>
<script type="text/javascript" src="https://unpkg.com/blob.js@1.0.1/Blob.js"></script>
<script type="text/javascript" src="https://unpkg.com/file-saver@1.3.3/FileSaver.js"></script>

<div style="display: block">
     <table id="js_table_xlsx">
         <tbody>
         <tr>
             <td><span>This</span></td>
             <td><span>is</span></td>
             <td><span>a</span></td>
             <td><span>Test</span></td>
         </tr>
         <tr>
             <td><span>வணக்கம்</span></td>
             <td><span>สวัสดี</span></td>
             <td><span>你好</span></td>
             <td><span>가지마</span></td>
         </tr>
         <tr>
             <td><span>1233</span></td>
             <td><span>2333</span></td>
             <td><span>3333</span></td>
             <td><span>43333</span></td>
         </tr>
         </tbody>
     </table>
 </div>
 <!-- 导出excel -->
 <button class="js_exportExcel">导出excel</button>

  /*
   *   导出 excel 表格 ，利用隐藏的excel
   * */
  $('.js_exportExcel').on('click', function () {
      exportExcel_Doit();
  });
  /*
   *   导出excel function
   * */
  function exportExcel_Doit(type, fn, dl) {
      var elt = document.getElementById('js_table_xlsx');
      var wb = XLSX.utils.table_to_book(elt, {sheet: "Sheet JS"});
      return dl ?
          XLSX.write(wb, {bookType: type, bookSST: true, type: 'base64'}) :
          XLSX.writeFile(wb, fn || ('test.' + (type || 'xlsx')));
  }