JSFiddle - React, Tailwind, and code Playground

HTML

<div id="months"></div>

JavaScript

window.onload = function() {
    document.getElementById("months").innerHTML = getMonth(11);   
};

for(var month=0; month < 11; month++)

function getMonth(month) {
    var monthName;
    if (month == 11) {
         monthName = "December";
     }
     return monthName;
 }

 function getMonth()
{
var x="",month=0;
while (month<11)
  {
  x=x + month + "<br>";
  i++;
  }
document.getElementById("months").innerHTML=x;
}