<script setup lang="ts">
import { ref, computed, onMounted } from 'vue'
import type { User } from '@/types'

// Props & Emits
const props = defineProps<{ userId: number }>()
const emit = defineEmits<{ (e: 'update', value: string): void }>()

// 响应式状态
const loading = ref(false)
const user = ref<User | null>(null)

// 计算属性
const displayName = computed(() => user.value?.name ?? '未知用户')

// 生命周期
onMounted(async () => { await fetchUser() })

// 方法
async function fetchUser() {
  loading.value = true
  try {
    user.value = await api.getUser(props.userId)
  } finally {
    loading.value = false
  }
}
</script>

<template>
  <div class="user-card">
    <h3>{{ displayName }}</h3>
  </div>
</template>

<style scoped>
.user-card { padding: 16px; }
</style>

// stores/user.ts
export const useUserStore = defineStore('user', () => {
  const user = ref<User | null>(null)
  const token = ref<string>('')

  const isLoggedIn = computed(() => !!token.value)

  async function login(username: string, password: string) {
    const res = await api.login(username, password)
    token.value = res.token
    user.value = res.user
  }

  return { user, token, isLoggedIn, login }
})

<template>
  <el-skeleton v-if="loading" :rows="5" animated />
  <el-result v-else-if="error" icon="error" :title="error">
    <template #extra>
      <el-button @click="fetchData">重试</el-button>
    </template>
  </el-result>
  <el-empty v-else-if="list.length === 0" description="暂无数据" />
  <template v-else>
    <!-- 正常内容 -->
  </template>
</template>

// types/user.ts
export interface User {
  id: number
  username: string
  role: 'admin' | 'user'
}

export interface ApiResponse<T = unknown> {
  code: number
  message: string
  data: T
}

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

// 请求防抖
import { useDebounceFn } from '@vueuse/core'
const debouncedSearch = useDebounceFn((keyword) => api.search(keyword), 300)

src/
├── api/                 # API 请求
├── components/          # 通用组件
├── composables/         # 组合式函数
├── router/              # 路由配置
├── stores/              # Pinia stores
├── types/               # TypeScript 类型
├── utils/               # 工具函数
├── views/               # 页面组件
├── App.vue
└── main.ts