vue 处理后端返回的文档流

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xiazai(){       this.$_api.kanbanApi       .Get({         responseType: 'blob',         url: 'KanbanItemData/exportExcel' //`${this.selectComponents.config.dataUrl}/exportExcel`       }).then(res=>{         console.log(res,'下载模板');       }).catch(err=>{         console.log(err,'err'); //响应封装问题  正常应该在then中          const url = window.URL.createObjectURL(new Blob([err],{type:"application/vnd.ms-excel;charset=utf-8"}));             const link = document.createElement('a');             link.href = url;             let fileName = '下载'+".xlsx";             link.setAttribute('download', fileName);             document.body.appendChild(link);             link.click();       })     },