Removing listener

To avoid any memory leaks, we should also useremoveEventListenerto get rid of the listener when the Vue instance is torn down. We can use thedestroyhook and call ourescapeKeyListenermethod for this purpose.

app.js:

new Vue({
  data: { ... },
  methods: { ... },
  watch: { ... },
  created: function() { ... },
  destroyed: function () {
    document.removeEventListener('keyup', this.escapeKeyListener);
  }
});