导入exel后端校验完直接返回结果excel流前端自动下载

var formData = new FormData(layero.find('form')[0]);
var xhr = new XMLHttpRequest();
xhr.responseType = 'blob';
xhr.onload = function (e) {
    if (this.status == 200) {
        $.modal.closeAll();
        var blob = this.response;
        var filename = "工程订单导入错误.xls";
        if (window.navigator.msSaveOrOpenBlob) {
            navigator.msSaveBlob(blob,filename);
        } else {
            var a = document.createElement('a');
            var url = URL.createObjectURL(blob);
            a.href = url;
            a.download = filename;
            document.body.appendChild(a);
            a.click();
            window.URL.revokeObjectURL(url);
        }
    }
};
xhr.open("POST", table.options.importUrl);
xhr.send(formData);