JS获取后台返回文件流

JS获取后台返回文件流

export(url, data) {
        const xhr = new XMLHttpRequest();
        xhr.open(this.requestMethod, url);
        xhr.setRequestHeader('Content-Type', 'application/json; charset=UTF-8');
        xhr.responseType = 'blob';
        xhr.onload = function (e) {
            const tmpDown = new Blob([this.response]);
            const a = document.createElement('a');
            a.href = URL.createObjectURL(tmpDown);
            a.download = 'export_result.xlsx';
            a.click();
        };
        xhr.send(JSON.stringify(data));
    }