<button type="button" class="btn">Click me</button>
body {
  margin: 16px;
  text-align: center;
  
}
const button = document.querySelector("button");

const onClick = () => {
  const timerId = setTimeout(() => {
    console.log("I love async JS!");
  }, 2000);

  console.log(timerId);
};

button.addEventListener("click", onClick);

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/materialize/0.98.2/css/materialize.min.css

External JavaScript

This Pen doesn't use any external JavaScript resources.