const ogr2ogr = require('ogr2ogr')

  // 声明一个geojson变量也可以是geojson文件目录
  var geojson = {
   type: 'FeatureCollection',
   features: [
    {
     type: 'Feature',
     geometry
    }
   ]
  }
  // shp保存目录
  const zipPath = './export/shpfile.zip'
  // 创建文件写入流
  var file = fs.createWriteStream(zipPath)
  // 调用ogr2ogr进行转化
  var ogr = ogr2ogr(geojson).project('EPSG:4326')
   .format('ESRI Shapefile')
   .skipfailures()
   .stream()
  ogr.pipe(file)

var resPath = path.join(__dirname, '..', zipPath)
res.sendFile(resPath)

  var resPath = path.join(__dirname, '..', zipPath)
  // 文件写入完成触发事件
  file.on('finish', function() {
   res.set({
    'Content-Type': 'application/zip',
    'Content-Disposition':
     'attachment; filename=' + encodeURI(name) + '.zip',
    'Content-Length': fs.statSync(zipPath).size
   })
   let fReadStream = fs.createReadStream(zipPath)
   fReadStream.pipe(res)
   fReadStream.on('end', function() {
    fs.unlinkSync(resPath)
   })
   fReadStream.on('error', function(err) {
    console.log(err)
   })
  })

   axios.post('http://localhost:3000/jsontoshp', {
    responseType: 'blob'
   }).then(res => {
    const blobUrl = URL.createObjectURL(res.data)
    const a = document.createElement('a')
    a.style.display = 'none'
    a.download = '文件名称'
    a.href = blobUrl
    a.click()
    URL.revokeObjectURL(blobUrl)
   })