##############
downloadfile(res) {
var blob = new Blob([res.data], {type: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document;charset=utf-8'}); //application/vnd.openxmlformats-officedocument.wordprocessingml.document这里表示doc类型
var contentDisposition = res.headers['content-disposition']; //从response的headers中获取filename, 后端response.setHeader("Content-disposition", "attachment; filename=xxxx.docx") 设置的文件名;
var patt = new RegExp("filename=([^;]+\\.[^\\.;]+);*");
var result = patt.exec(contentDisposition);
var filename = result[1];
var downloadElement = document.createElement('a');
var href = window.URL.createObjectURL(blob); //创建下载的链接
var reg = /^["](.*)["]$/g;
downloadElement.style.display = 'none';
downloadElement.href = href;
downloadElement.download = decodeURI(filename.replace(reg,"$1")); //下载后文件名
document.body.appendChild(downloadElement);
downloadElement.click(); //点击下载
document.body.removeChild(downloadElement); //下载完成移除元素
window.URL.revokeObjectURL(href); //释放掉blob对象
}
##########################

let requsetFile = (params,baseurl,url) =>{
 axios({
  method: 'get',
  baseURL:baseurl,
  url: url,
  headers: {'Content-Type': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'}, //定义相应头
  responseType: 'blob',  //定义
  data:params.query || {}
 })
  .then(function(res){
   params.success && params.success(res)
  })
  .catch(function(error){
   params.error && params.error(error)
  })
}
//下面为判断headers和转化blob为json
api.Templet({
      success:res=>{
       const isEXCLE = res.headers["content-type"] === ("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" || "application/vnd.ms-excel");
       if(!isEXCLE){
        let reader = new FileReader();
        reader.onload = e => this.$message.error(JSON.parse(e.target.result).msg);
        reader.readAsText(res.data);
       }else {
        let blob = new Blob([res.data], {type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"});
        const fileName = `模板文件${Date.parse(new Date())}.xlsx`;
        if ('download' in document.createElement('a')) { // 非IE下载
         const elink = document.createElement('a');
         elink.download = fileName;
         elink.style.display = 'none';
         elink.href = URL.createObjectURL(blob);
         document.body.appendChild(elink);
         elink.click();
         URL.revokeObjectURL(elink.href); // 释放URL 对象
         document.body.removeChild(elink);
        } else { // IE10+下载
         navigator.msSaveBlob(blob, fileName);
        }
       }
      }
     })