download files, csv, pdf, excel, zip files using ajax javascript, jquery

gistfile1.txt

async function getZipAsync(form) {
            let response = await fetch("/BuyerReport/NewCharges" + '?' + (new URLSearchParams($(form).serialize())).toString());
            let res = await response.blob();
            if (res.type === 'application/zip') {
                const downloadUrl = window.URL.createObjectURL(res);
                const link = document.createElement('a');
                link.setAttribute('href', downloadUrl);
                link.setAttribute('download', 'new charges report');
                link.style.display = 'none';
                document.body.appendChild(link);
                link.click();
                window.URL.revokeObjectURL(link.href);
                document.body.removeChild(link);
            } else {
                alert("Your bulk export is larger than 50 MB. It will be sent as a link to your email address.");
            }
            showHideSpinner(false);
        }
        function download(data, filename, type) {
            var file = new Blob([data], { type: type });
            if (window.navigator.msSaveOrOpenBlob) // IE10+
                window.navigator.msSaveOrOpenBlob(file, filename);
            else { // Others
                var a = document.createElement("a"),
                    url = URL.createObjectURL(file);
                a.href = url;
                a.download = filename;
                document.body.appendChild(a);
                a.click();
                setTimeout(function () {
                    document.body.removeChild(a);
                    window.URL.revokeObjectURL(url);
                }, 0);
            }
        }