导出文件时，responseType设置为'arraybuffer'出错？

 async download(params) {
  return await  $axios.$post(`url`,params,{ responseType: 'arraybuffer'})
  },

let formData = new FormData();

formData.append('file',file);//传文件

this.$api.download(formData).then(res=>{
 
const data = new Blob([res],{type:'application/vnd.ms-excel'})
 
const url = URL.createObjectURL(data)
 
const a = document.createElement('a')
 
a.href = url
 
a.download = 'table.xls'
 
a.click()
// 释放这个临时的对象objectUrl
URL.revokeObjectURL(url)
 
}

let enc = new TextDecoder('utf-8')
let data = JSON.parse(enc.decode(new Uint8Array(res.data)))

$axios.onError(error => {
  let enc = new TextDecoder('utf-8')
  let blob = JSON.parse(enc.decode(new Uint8Array(error.response.data)))
  Vue.prototype.$message.error(blob.data);
})