JSFiddle - React, Tailwind, and code Playground

HTML

Reverse String: <input type="text" id="reverseString"/><br/>
        <input type="button" value="Submit" onClick="funcreverse()"/>

JavaScript

function funcreverse () {
            var s = document.getElementById('reverseString').value;
var reversed = '';
            for (var i = s.length - 1; i >= 0; i--) {
                reversed += s[i];
            }

            document.getElementById('reverseString').disabled = true;
            document.getElementById('reverseString').value = reversed;
        };