How to export data to excel using javascript?

1) Writing html code below

<input type="button" id="btnExport" value=" Export Table data into Excel " />
<br/>
<br/>
<div id="vishare4all">
    <table>
        <tr>
            <th>Column One</th>
            <th>Column Two</th>
        </tr>
        <tr>
            <td>row1 Col1</td>
            <td>row1 Col2</td>
        </tr>
        <tr>
            <td>row2 Col1</td>
            <td>row2 Col2</td>
        </tr>
        <tr>
            <td>row3 Col1</td>
            <td>www.vishare4all.blogspot.com</td>
        </tr>
    </table>
</div>

2) Javascript code

$("#btnExport").click(function (e) {
    window.open('data:application/vnd.ms-excel,' + $('#vishare4all').html());
    e.preventDefault();
});

3) Writing the css code

body {
    font-size: 12pt;
    font-family: Calibri;
    padding : 10px;
}
table {
    border: 1px solid black;
}
th {
    border: 1px solid black;
    padding: 5px;
    background-color:grey;
    color: white;
}
td {
    border: 1px solid black;
    padding: 5px;
}
input {
    font-size: 12pt;
    font-family: Calibri;
}

Result will see like this: