JSFiddle - React, Tailwind, and code Playground

HTML

<input class="btn btn-primary" onclick="export_Excel()" title="Export Excel" type="button" value="Export to Excel" />

JavaScript

var result_table = [
										["Day", "Month", "Year"],
                    ["1", "January", "2016"], 
                    ["2", "February", "2016"],
                    ["3", "March", "2016"],
                    ["4", "April", "2016"],
                   ];


function export_Excel() {
    var lineArray = [];
    result_table.forEach(function (infoArray, index) {
        var line = infoArray.join(",");
        lineArray.push(index == 0 ? "data:application/vnd.ms-excel;charset=utf-8," + line : line);
    });
    var csvContent = lineArray.join("\n");
    window.open(encodeURI(csvContent));
}