JSFiddle - React, Tailwind, and code Playground

HTML

<ul id = "qualquer">
    <li id = "listitem1">
    </li>
    <li id = "listitem2">
    </li>
    <li id = "listitem3">
    </li>
</ul>

JavaScript

//adding the id middle_item to the li with the id listitem1
$("#listitem1").attr("id","middle_item")

//imagine at this point you dont know which li has the id middle_item
var i = $("middle_item").id;
    		alert(i);