JSFiddle - React, Tailwind, and code Playground

by brecht

HTML

<div id="register">
  <h1>報名系統</h1>
  <div>目前有<strong>0</strong>人報名</div>
  <button>我要報名</button>
</div>

<h2><strong>0</strong>人報名</h2>

JavaScript

var counter = $('#register div strong');

var counterH2 = $('h2 strong');

$('#register button').click(function(){
     var counterValue = counter.text();
     counterValue = ++counterValue;
     counter.text(counterValue);
     counterH2.text(counterValue);
});