<template>
  <div class="card">
    <header>
      <div>標(biāo)題</div>
      <div>副標(biāo)題</div>
    </header>
    <section>內(nèi)容</section>
  </div>
</template>
<script setup lang="ts">
</script>
<style lang="less" scoped>
@border: #ccc;
.card {
  border: 1px solid @border;
  width: 400px;
  header {
    display: flex;
    justify-content: space-between;
    padding: 5px;
    border-bottom: 1px solid @border;
  }
  section{
    padding: 5px;
    min-height: 300px;
  }
}
</style>

<template>
  <div>
    <CardVue></CardVue>
  </div>
</template>
<script setup lang="ts">
import CardVue from './components/Card.vue'
</script>
<style lang="scss" scoped>
</style>

<template>
  <div>
    <Card></Card>
  </div>
</template>
<script setup lang="ts">
</script>
<style lang="scss" scoped></style>

import { createApp } from 'vue'
import App from './App.vue'
import CardVue from './components/Card.vue'
export const app = createApp(App)
app.component('Card', CardVue)
app.mount('#app')

<template>
  <div>
      <h1>this is a title</h1>
  </div>
</template>
<script setup lang="ts">
</script>
<style lang="scss" scoped>
h1 {
  border: 1px solid black;
}
</style>

<template>
  <div>
    <Card></Card>
    <Tree></Tree>
  </div>
</template>
<script setup lang="ts">
</script>
<style lang="scss" scoped></style>

import { createApp, defineAsyncComponent } from 'vue'
import App from './App.vue'
const app = createApp(App)
const componentNames = ['Card', 'Tree'];
// 使用動(dòng)態(tài)導(dǎo)入的方式注冊(cè)全局組件時(shí)需要注意異步組件的加載
// 異步組件使用 defineAsyncComponent 方法來(lái)處理動(dòng)態(tài)導(dǎo)入的組件，并且使用 await 關(guān)鍵字等待組件的加載完成。在組件加載完成后，再將其注冊(cè)為全局組件。
// 如果沒(méi)有注意異步組件的加載，會(huì)報(bào) Invalid VNode type: undefined (undefined) 的問(wèn)題
async function registerComponents() {
  for (const componentName of componentNames) {
    // 使用 defineAsyncComponent 方法動(dòng)態(tài)導(dǎo)入異步組件
    const component = await defineAsyncComponent(() => import(`./components/${componentName}.vue`));
    app.component(componentName, component);
  }
  app.mount('#app');
}
registerComponents();