Refer to A-tag in javascript

'use strict';
document.addEventListener('DOMContentLoaded', init);

function init() {
  document.querySelector('.info .order').addEventListener('click', addToCart);
}

function addToCart(e) {
  e.preventDefault();
  alert("test");
}

<article data-id="2"><h3></h3><figure><img src="#"><figcaption></figcaption></figure><div class="info"><a class="order">Order</a></div></article>