动态组件与异步组件

动态组件

使用 <component> 标签和 :is 属性动态切换组件：

<template>
  <component :is="currentTab"></component>
  <button @click="currentTab = 'Home'">首页</button>
  <button @click="currentTab = 'Posts'">文章</button>
</template>

<script>
import Home from './Home.vue'
import Posts from './Posts.vue'

export default {
  components: { Home, Posts },
  data() {
    return { currentTab: 'Home' }
  }
}
</script>

keep-alive 缓存

<keep-alive>
  <component :is="currentTab"></component>
</keep-alive>

使用 <keep-alive> 保持组件状态，避免重新渲染。

异步组件

import { defineAsyncComponent } from 'vue'

const AsyncComp = defineAsyncComponent(() =>
  import('./components/HeavyComponent.vue')
)

加载状态

const AsyncComp = defineAsyncComponent({
  loader: () => import('./HeavyComponent.vue'),
  loadingComponent: LoadingSpinner,
  delay: 200,       // 延迟显示 loading
  timeout: 3000     // 超时时间
})

路由懒加载

const routes = [
  {
    path: '/dashboard',
    component: () => import('./views/Dashboard.vue')
  }
]

异步组件结合路由懒加载是优化首屏性能的标准做法。

要点总结

• <component :is="..."> 实现动态组件切换
• <keep-alive> 缓存动态组件状态
• defineAsyncComponent 实现异步加载
• 路由懒加载使用动态 import()