Parent component:a.vue
Subcomponents:ab.vue
ab.vue
this.$emit('increment')
a.vue
<!--cmty--><!--cmty_prevent_hook--><div align="right"><sub><em>This question is available on <a href="https://nuxtjs.cmty.io">Nuxt.js</a> community (<a href="https://nuxtjs.cmty.io/nuxt/nuxt.js/issues/c823">#c823</a>)</em></sub></div><ab @increment='incrementTotal'></ab>
methods: {
incrementTotal: function () {
this.total += 1
}
}