下载并将c# excel字节数组转换为javascript blob

using OfficeOpenXml;
using System.IO;

public byte[] GenerateExcelFile()
{
    using (var package = new ExcelPackage())
    {
        var worksheet = package.Workbook.Worksheets.Add("Sheet1");
        worksheet.Cells["A1"].Value = "Hello";
        worksheet.Cells["B1"].Value = "World";

        return package.GetAsByteArray();
    }
}

function convertByteArrayToBlob(byteArray) {
    var binaryString = window.atob(byteArray);
    var len = binaryString.length;
    var bytes = new Uint8Array(len);

    for (var i = 0; i < len; i++) {
        bytes[i] = binaryString.charCodeAt(i);
    }

    return new Blob([bytes]);
}

// 假设从后端获取到的Base64字符串为response.data
var blob = convertByteArrayToBlob(response.data);