安装

npm install -g @vue/cli
vue upgrade --next

创建

const app = Vue.createApp({
  data() {
    return { count: 4 }
  }
})

const vm = app.mount('#app')

组件

const Component = defineComponent({
  data() {
    return {
      count: 0
    }
  },
  mounted() {
    const result = this.count.split('') // => Property 'split' does not exist on type 'number'
  }
})

钩子

• onBeforeMount
• onMounted
• onBeforeUpdate
• onUpdated
• onBeforeUnmount
• onUnmounted
• onErrorCaptured
• onRenderTracked
• onRenderTriggered
• onActivated
• onDeactivated