JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="myString" /><br/>
<button id="set" type="button">Set String</button>
<button id="get" type="button">Get String</button>

JavaScript

$(function() {
    $('#set').click(write);
    $('#get').click(read);
});

function write() {
    $('body').data('myVal', $('#myString').val());
}

function read() {
    alert($('body').data('myVal'));
}