JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<textarea id="test"></textarea>
<button id="button_test">Ok</button>

JavaScript

$(document).ready(function()
{
$("#test").val("123e2oierhqwpoiefdhqwopidfhjcospid");

});

$("#button_test").on("click",function()
{
var as=document.getElementById("test").value;
console.log(as);
});