原代码：

download(item) {this.axios.get(api.download+'/'+item.name).then(res => {// console.log(res)let bob = new Blob([res.data],{type: 'application/vnd.ms-excel'})const link = document.createElement('a');let url = window.URL.createObjectURL(bob);link.download = '下载文件.xlsx';link.href = url;document.body.appendChild(link);link.click();document.body.removeChild(link);})},

参考文章：javascript下载纯文本、下载Excel，前端解析Excel，下载的Excel无法打开问题解决_前端下载文件流无法打开-CSDN博客

修改：axios请求时需要设置响应类型

download(item) {this.axios.get(api.download+'/'+item.name,{responseType:"blob"}).then(res => {// console.log(res)let bob = new Blob([res.data],{type: 'application/vnd.ms-excel'})const link = document.createElement('a');let url = window.URL.createObjectURL(bob);link.download = '下载文件.xlsx';link.href = url;document.body.appendChild(link);link.click();document.body.removeChild(link);})},