JSFiddle - React, Tailwind, and code Playground

HTML

<div>here is @ that we are @ replacing</div>
<div>here is another @ that we are replacing</div>
<input id=idBut type=button value="replace @ with $" />

JavaScript

$("#idBut").click(function() {
    $("body").children().each(function() {
        $(this).html($(this).html().split('@').join("$"));
    });
});