JSFiddle - React, Tailwind, and code Playground
HTML
<script language="javascript">
var visitorName = 'Chuck';
var myOldString = 'Hello username. I hope you enjoy your stay username.';
var myNewString = myOldString.replace ('username', visitorName);
document.write('Old String = ' + myOldString);
document.write('<br/>New string = ' + myNewString);
</script>JavaScript
$("#textarea").keydown(function() {
alert($("#textarea").val());
});