bootstrap-vue/src/components/alert/fixtures/alert.js

BootstrapVue provides one of the most comprehensive implementations of Bootstrap 4 components and grid system for Vue.js and with extensive and automated WAI-ARIA accessibility markup.

window.app = new Vue({
  el: '#app',
  data: {
    dismissCountDown: null,
    showDismissibleAlert: false
  },
  methods: {
    countDownChanged (dismissCountDown) {
      this.dismissCountDown = dismissCountDown
    },
    showAlert () {
      this.dismissCountDown = 5
    }
  }
})