jQuery addClass example

Change class name on click in jQuery

by Ben Watts

HTML

<div id="app">

</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#banner-message {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  font-size: 25px;
  text-align: center;
  transition: all 0.2s;
  margin: 0 auto;
  width: 300px;
}

button {
  background: #0084ff;
  border: none;
  border-radius: 5px;
  padding: 8px 14px;
  font-size: 15px;
  color: #fff;
}

#banner-message.alt {
  background: #0084ff;
  color: #fff;
  margin-top: 40px;
  width: 200px;
}

#banner-message.alt button {
  background: #fff;
  color: #000;
}

JavaScript

var t0 = performance.now();
const $app = document.getElementById('app');
$app.innerHTML = "<div><h1>Hello World!</h1></div>";
$app.getElementsByTagName("h1")[0].style.display = "none";
var t1 = performance.now();
console.log("Call to creating app " + (t1 - t0) + " milliseconds.")