npm init vite-app <project-name>

import path from 'path'

module.exports = {
 alias: {
 '/@/': path.resolve(__dirname, './src')
 },
 optimizeDeps: {
 include: ['lodash']
 },
 proxy: {}
}

import { createRouter, createWebHistory } from 'vue-router'

const routes = [
 {
 path: '/',
 name: 'Home',
 component: () => import('/@/views/Home.vue')
 },
 {
 path: '/lifeCycle',
 name: 'lifeCycle',
 component: () => import('/@/views/LifeCycle.vue')
 }
]

export default createRouter({
 history: createWebHistory('/krry/'),
 routes
})

{
 "compilerOptions": {
 ...// 其他配置
 "paths": {
  "/@/*": [
  "src/*"
  ]
 },
 "lib": [
  "esnext",
  "dom",
  "dom.iterable",
  "scripthost"
 ]
 },
 "include": [
 "src/**/*.ts",
 "src/**/*.tsx",
 "src/**/*.vue",
 "src/types/images.d.ts",
 "tests/**/*.ts",
 "tests/**/*.tsx"
 ],
 "exclude": [
 "node_modules"
 ]
}

declare module '*.vue' {}

declare module '*.svg'
declare module '*.png'
declare module '*.jpg'
declare module '*.jpeg'
declare module '*.gif'
declare module '*.bmp'
declare module '*.tiff'

import { createApp } from 'vue'
import router from '/@/router'

import App from '/@/App.vue'

const app = createApp(App)
app.use(router)
app.mount('#app')

// props - 組件接受到的屬性 context - 上下文 
setup(props, context) {
 return {
 // 要綁定的數(shù)據(jù)和方法
 }
}

import { toRefs } from 'vue'

setup(props) {
 const { title } = toRefs(props)
 console.log(title.value)
}

setup() {
 onMounted(() => {
 console.log('組件掛載')
 })

 onUnmounted(() => {
 console.log('組件卸載')
 })

 onUpdated(() => {
 console.log('組件更新')
 })

 onBeforeUpdate(() => {
 console.log('組件將要更新')
 })

 onActivated(() => {
 console.log('keepAlive 組件 激活')
 })

 onDeactivated(() => {
 console.log('keepAlive 組件 非激活')
 })

 return {}
}

<template>
 <div>
 <div>
  <ul v-for="ele in eleList" :key="ele.id">
  <li>{{ ele.name }}</li>
  </ul>
  <button @click="addEle">添加</button>
 </div>
 <div>
  <ul v-for="ele in todoList" :key="ele.id">
  <li>{{ ele.name }}</li>
  </ul>
  <button @click="addTodo">添加</button>
 </div>
 </div>
</template>

<script>
import { ref, reactive, toRefs } from 'vue'

export default {
 setup() {
 // ref
 const eleList = ref([])
 function addEle() {
  let len = eleList.value.length
  eleList.value.push({
  id: len,
  name: 'ref 自增' + len
  })
 }

 // reactive
 const dataObj = reactive({
  todoList: []
 })
 function addTodo() {
  let len = dataObj.todoList.length
  dataObj.todoList.push({
  id: len,
  name: 'reactive 自增' + len
  })
 }

 return {
  eleList,
  addEle,
  addTodo,
  ...toRefs(dataObj)
 }
 }
}
</script>

// computed
let sum = computed(() => dataObj.todoList.length + eleList.value.length)
console.log('setup引用computed要.value：' + sum.value)

// watch
watch(
 eleList,
 (curVal, oldVal) => {
 console.log('監(jiān)聽(tīng)器：', curVal, oldVal)
 },
 {
 deep: true
 }
)

const count = ref(0)
// 當(dāng) count 的值被修改時(shí)，會(huì)執(zhí)行回調(diào)
const stop = watchEffect(() => console.log(count.value))

// 停止監(jiān)聽(tīng)
stop()

const unwatch = this.$watch('say', curVal => {})

// 停止監(jiān)聽(tīng)
unwatch()

import {useRoute, useRouter} from 'vue-router'

const route = useRoute() // 相當(dāng)于 vue2 中的 this.$route
const router = useRouter() // 相當(dāng)于 vue2 中的 this.$router

import {useStore} from 'vuex'

setup(){
 const store = useStore() // 相當(dāng)于 vue2 中的 this.$store
 store.dispatch() // 通過(guò) store 對(duì)象來(lái) dispatch 派發(fā)異步任務(wù)
 store.commit() // commit 修改 store 數(shù)據(jù)
 
 let category = computed(() => store.state.home.currentCagegory
 return { category }
}