JS - 处理返回文件流

var xmlResquest = new XMLHttpRequest();
        xmlResquest.open("POST", "/download", true);
        xmlResquest.setRequestHeader("Content-type", "application/json");
        xmlResquest.setRequestHeader("Authorization", "token-value");
        xmlResquest.responseType = "blob";
        xmlResquest.onload = function (oEvent) {
                var content = xmlResquest.response;
                var elink = document.createElement('a');
                elink.download = "test.xlsx";
                elink.style.display = 'none';
                var blob = new Blob([content]);
                elink.href = URL.createObjectURL(blob);
                document.body.appendChild(elink);
                elink.click();
                document.body.removeChild(elink);
            };
            xmlResquest.send();

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