JSFiddle - React, Tailwind, and code Playground

HTML

<button class="like" onclick="plusOne()">like</button>
<div id="root"></div>

JavaScript

const printLikes = (likes) => {
  document.querySelector("#root").innerHTML=likes;
}

let likes = +localStorage.getItem("likes") || 0;
printLikes(likes);

const plusOne = () => {
  likes++;
  printLikes(likes);
  localStorage.setItem("likes", likes);  
}