js下载后台返回的excel文件流

        function download(filename) {
            var oReq = new XMLHttpRequest();
            oReq.open("GET", "<你的返回流的Action路径>", true);
            oReq.responseType = "blob";
            oReq.onload = function (oEvent) {
                var content = oReq.response;
 
                var elink = document.createElement('a');
                elink.download = filename;
                elink.style.display = 'none';
 
                var blob = new Blob([content]);
                elink.href = URL.createObjectURL(blob);
 
                document.body.appendChild(elink);
                elink.click();
 
                document.body.removeChild(elink);
            };
            oReq.send();
        }