JSFiddle - React, Tailwind, and code Playground

HTML

<div>here is mohit that we are mohit replacing</div>
<div>here is another mohit 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().replace(/@/g,"$"));
    });
});