JSFiddle - React, Tailwind, and code Playground

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<div class="box">
    <p>
        content
    </p>
</div>
<div class="box">
    <p>
        content
    </p>
</div>
<div class="box">
    <p>
        content
    </p>
</div>

JavaScript

$(".box").each(function(i, div) {
  div.id = "div" + (i+1); //i starts at 0
});

alert($(".box:last").attr("id"));