Javascript Algorithm to get the excel-like column name

Basically what I want to do is create list of characters with format like excel column name.

for example : a,b,c,d,.....,z,aa,ab,ac,....,yz

in php you can just looping it with this code:

for($char = "A"; $char <= "Z"; $char++) 
{
    echo $char . "\n";
}

but when I try it in javascript :

 var i3;
 var text3 = "";

for(i3 = "A"; i3 <= "Z"; i3++)
{
    text3 += i3 + ", ";
}

document.getElementById("pId").innerHTML = text3;

It doesn't work for me. Are there some errors in my code? Or that PHP logic doesn't work in JS? If you know how to make one please tell me, thanks.

In javacript the incrementor operator will return NaN when called on a string value.

You can use ascii code based implementation like

var i3, i4;
var text3 = "";

for (i3 = 0; i3 < 26; i3++) {
  text3 += String.fromCharCode(97 + i3) + ", ";
}
for (i3 = 0; i3 < 26; i3++) {
  for (i4 = 0; i4 < 26; i4++) {
    text3 += String.fromCharCode(97 + i3) + String.fromCharCode(97 + i4) + ", ";
  }
}


document.getElementById("pId").innerHTML = text3;

<span id="pId"></span>