我也是網(wǎng)上抄的復(fù)制下面兩個(gè)方法，直接調(diào)用fileLinkToStreamDownload 就能下載

function fileLinkToStreamDownload(url, fileName, type){
let reg = /^([hH][tT]{2}[pP]://|[hH][tT]{2}[pP][sS]://)(([A-Za-z0-9-_{]+).)+([A-Za-z0-9-}/])+{type}`);
xhr.responseType = "blob";
xhr.onload = function () {
if (this.status == 200) {
//接受二進(jìn)制文件流
var blob = this.response;
downloadExportFile(blob, fileName, type)
}
};
xhr.send();
}
}

/**
*下載導(dǎo)出文件

• @param blob ：返回?cái)?shù)據(jù)的blob對(duì)象或鏈接
• @param tagFileName ：下載后文件名標(biāo)記
• @param fileType ：文件類(lèi) word(docx) excel(xlsx) ppt等
  */
  function downloadExportFile(blob, tagFileName, fileType) {
  let downloadElement = document.createElement('a');
  let href = blob;
  if (typeof blob == 'string') {
  downloadElement.target = '_blank';
  } else {
  href = window.URL.createObjectURL(blob); //創(chuàng)建下載的鏈接
  }
  downloadElement.href = href;
  downloadElement.download = tagFileName + moment(new Date().getTime()).format('YYYYMMDDhhmmss') + '.' + fileType; //下載后文件名
  document.body.appendChild(downloadElement);
  downloadElement.click(); //點(diǎn)擊下載
  document.body.removeChild(downloadElement); //下載完成移除元素
  if (typeof blob != 'string') {
  window.URL.revokeObjectURL(href); //釋放掉blob對(duì)象
  }
  }

抄的原博客地址 https://www.cnblogs.com/jackson-yqj/p/11321275.html