JSFiddle - React, Tailwind, and code Playground

HTML

<table id="tabl" border="1">
            <tr>
        <td>01</td>
            <td>02</td>
        <td>03</td>
            <td>04</td>
        <td>05</td>
            <td>06</td>
        </tr>
    </table>
<input type="button" value="Calculate" onclick="Calc()">

JavaScript

window.Calc = function()
{
i=0
temp=0;
ab=0;
while(i<=5)
{
ab=document.getElementById("tabl").rows[0].cells[i].innerHTML;
temp += parseFloat(ab);
i++
}
    alert(temp);
}