JSFiddle - React, Tailwind, and code Playground

HTML

<div id="w1" name='w1-0' onclick="weekclick(id)">1<br /></div>
<div onclick="weekclick('w1');">click me</div>

JavaScript

function weekclick(id) {    
    document.getElementById(id).setAttribute("name","w1-1");
    alert(document.getElementById(id).attributes["name"].value);
}