后台api接口

 [HttpGet]
        public HttpResponseMessage DownloadFile(string fileName)
        {
            //fileName = "123.txt";
            //文件的服务器地址
            string filePath = HttpContext.Current.Server.MapPath("~/kaoqinwj/"+fileName);//路径
            FileStream stream = new FileStream(filePath, FileMode.Open);
            HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
            response.Content = new StreamContent(stream);
            response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
            {
                FileName = HttpUtility.UrlEncode(fileName)
            };
            response.Headers.Add("Access-Control-Expose-Headers", "FileName");
            response.Headers.Add("FileName", HttpUtility.UrlEncode(fileName));
            return response;
        }

我这是传了一个文件名称
前台vue: 不传参的话可以直接使用 a 标签

<el-button type="text" icon="el-icon-download" @click="Xiazai(scope.row.storeName,scope.row.statisticsDate)">
                            下载该文件</el-button>
                            <!-- <a href="http://localhost:58248/api/WenjianXZ">下载文件</a> -->

axios传参

axios.get('/WenjianXZ?fileName='+file)
.then(res => {
    console.log(res)
    window.location.href = res.config.url;//接收下载
})
.catch(err => {
    console.error(err); 
})