JSFiddle - React, Tailwind, and code Playground

HTML

<h1>ahh</h1>
<h1 id="whatever">ahh</h1>
<h1>ahh</h1>
<h1>ahh</h1>

JavaScript

$(document).ready(function () {
    $("h1:not([id])").attr("id", function (i, attr) {
        return "h1" + i + (new Date().getTime());
    });
});