javascript excellent export b64 to blob wont work

Question

I'm new to javascript and I have an existing code:

var uri = {excel: 'data:application/vnd.ms-excel;base64,', csv: 'data:application/csv;base64,'};

var base64 = function(s) {
    return window.btoa(window.unescape(encodeURIComponent(s)));
};

var format = function(s, c) {
    return s.replace(new RegExp("{(\\w+)}", "g"), function(m, p) {
        return c[p];
    });
};

excel: function(anchor, table, name) {
     table = get(table);
     var ctx = {worksheet: name || 'Worksheet', table: table.innerHTML};
     var hrefvalue = base64(format(template.excel, ctx));
     anchor.href = hrefvalue;
     // Return true to allow the link to work
     return true;
 }

This returns "data:application/vnd.ms-excel;base64,sdsssapqPphgrtG1ks...." which is b64 data. It works if the records I'm trying to export is less than 2000 but does not work if more than 2000 records.

I modified it by converting the data to blob:

   excel: function(anchor, table, name) {
        table = get(table);
        var ctx = {worksheet: name || 'Worksheet', table: table.innerHTML};
        var hrefvalue = base64(format(template.excel, ctx));
        var blob = b64toBlob(hrefvalue, "application/vnd.ms-excel");
        var blobUrl = window.URL.createObjectURL(blob);
        window.location = blobUrl;
        // Return true to allow the link to work
        return true;
    },

function b64toBlob(b64Data, contentType, sliceSize) {
contentType = contentType || '';
sliceSize = sliceSize || 512;

var byteCharacters = atob(b64Data);
var byteArrays = [];

for (var offset = 0; offset < byteCharacters.length; offset += sliceSize) {
    var slice = byteCharacters.slice(offset, offset + sliceSize);

    var byteNumbers = new Array(slice.length);
    for (var i = 0; i < slice.length; i++) {
        byteNumbers[i] = slice.charCodeAt(i);
    }

    var byteArray = new Uint8Array(byteNumbers);

    byteArrays.push(byteArray);
}

var blob = new Blob(byteArrays, {type: contentType});
return blob;

}

But it returns "blob:http://localhost:8888/97e93f9a-51ea-4480-9434-634061497e3f" which is different from the current output. I can now export more than 2000 records but in the spreadsheet it also contains the elements name of my webpage (button, menu, textbox) plus it downloads an extra file with a naming convention of 97e93f9a-51ea-4480-9434-634061497e3f. opening the file contains the html format of the records.

How is it downloading an extra file? and how to properly create the spreadsheet to omit elements from my webpage?