vue2.x 下载后台传过来的流文件（excel）后乱码…

//      导出订单
      exportBill:function () {

        let url_post = Vue.prototype.api.apiList.EXPORT_BILL;

        let params_post = {
          orderStartDate: this.timepickerDateFormat(this.rangeTime[0]) || this.rangeTime[0] || '',
          orderEndDate: this.timepickerDateFormat(this.rangeTime[1]) || this.rangeTime[1] || '',
          prodCode: this.prodId,
          promoteFlag: this.promotionSiteId,
          policyStatusList: this.tableBillStateCheckedData,
        };

        Vue.axios.post(url_post,params_post,{responseType: 'arraybuffer'}).then((res) => {

          let fileName = res.headers['content-disposition'].match(/fushun(\S*)xls/)[0];

          fileDownload(res.data,fileName);  //如果用方法一 ，这里需要安装 npm install js-file-download --save ,然后引用 var fileDownload = require('js-file-download')，使用详情见github;

　　　　　　// let blob = new Blob([res.data], {type: "application/vnd.ms-excel"}); 

　　　　　　// let objectUrl = URL.createObjectURL(blob); 

　　　　　　// window.location.href = objectUrl;  

　　　　}).catch(function (res) {}); },