Vue3.2中setup语法糖的使用教程分享

<template>
</template>
<script setup>
</script>
<style scoped lang="less">
</style>

<script setup>
    import {
      ref,
reactive,
      toRefs,
    } from 'vue'
    const data = reactive({
      patternVisible: false,
      debugVisible: false,
      aboutExeVisible: false,
    })
    const content = ref('content')
    //使用toRefs解构
    const { patternVisible, debugVisible, aboutExeVisible } = toRefs(data)
</script>

<template >
    <button @click="onClickHelp">系统帮助</button>
</template>
<script setup>
import {reactive} from 'vue'
const data = reactive({
      aboutExeVisible: false,
})
// 点击帮助
const onClickHelp = () => {
    console.log(`系统帮助`)
    data.aboutExeVisible = true
}
</script>

<script setup>
import {
  ref,
  watchEffect,
} from 'vue'
let sum = ref(0)
watchEffect(()=>{
  const x1 = sum.value
  console.log('watchEffect所指定的回调执行了')
})
</script>

<script setup>
    import {
      reactive,
      watch,
    } from 'vue'
     //数据
     let sum = ref(0)
     let msg = ref('你好啊')
     let person = reactive({
                    name:'张三',
                    age:18,
                    job:{
                      j1:{
                        salary:20
                      }
                    }
                  })
    // 两种监听格式
    watch([sum,msg],(newValue,oldValue)=>{
            console.log('sum或msg变了',newValue,oldValue)
          },{immediate:true})
     watch(()=>person.job,(newValue,oldValue)=>{
        console.log('person的job变化了',newValue,oldValue)
     },{deep:true}) 
</script>

<script setup>
    import {
      reactive,
      computed,
    } from 'vue'
    //数据
    let person = reactive({
       firstName:'小',
       lastName:'叮当'
     })
    // 计算属性简写
    person.fullName = computed(()=>{
        return person.firstName + '-' + person.lastName
      }) 
    // 完整写法
    person.fullName = computed({
      get(){
        return person.firstName + '-' + person.lastName
      },
      set(value){
        const nameArr = value.split('-')
        person.firstName = nameArr[0]
        person.lastName = nameArr[1]
      }
    })
</script>

<template>
  <span>{{props.name}}</span>
</template>
<script setup>
  import { defineProps } from 'vue'
  // 声明props
  const props = defineProps({
    name: {
      type: String,
      default: '11'
    }
  })  
  // 或者
  //const props = defineProps(['name'])
</script>

<template>
  <child :name='name'/>  
</template>
<script setup>
    import {ref} from 'vue'
    // 引入子组件
    import child from './child.vue'
    let name= ref('小叮当')
</script>

<template>
   <a-button @click="isOk">
     确定
   </a-button>
</template>
<script setup>
import { defineEmits } from 'vue';
// emit
const emit = defineEmits(['aboutExeVisible'])
/**
 * 方法
 */
// 点击确定按钮
const isOk = () => {
  emit('aboutExeVisible');
}
</script>

<template>
  <AdoutExe @aboutExeVisible="aboutExeHandleCancel" />
</template>
<script setup>
import {reactive} from 'vue'
// 导入子组件
import AdoutExe from '../components/AdoutExeCom'
const data = reactive({
  aboutExeVisible: false, 
})
// content组件ref
// 关于系统隐藏
const aboutExeHandleCancel = () => {
  data.aboutExeVisible = false
}
</script>

<template>
    <p>{{data }}</p>
</template>
<script setup>
import {
  reactive,
  toRefs
} from 'vue'
/**
 * 数据部分
 * */
const data = reactive({
  modelVisible: false,
  historyVisible: false, 
  reportVisible: false, 
})
defineExpose({
  ...toRefs(data),
})
</script>

<template>
    <button @click="onClickSetUp">点击</button>
    <Content ref="content" />
</template>
<script setup>
import {ref} from 'vue'
// content组件ref
const content = ref('content')
// 点击设置
const onClickSetUp = ({ key }) => {
   content.value.modelVisible = true
}
</script>
<style scoped lang="less">
</style>

<script setup>
  import { useRoute, useRouter } from 'vue-router'
  // 声明
  const route = useRoute()
  const router = useRouter()
  // 获取query
  console.log(route.query)
  // 获取params
  console.log(route.params)
  // 路由跳转
  router.push({
      path: `/index`
  })
</script>

<script setup>
  import { useStore } from 'vuex'
  import { num } from '../store/index'
  const store = useStore(num)
  // 获取Vuex的state
  console.log(store.state.number)
  // 获取Vuex的getters
  console.log(store.state.getNumber)
  // 提交mutations
  store.commit('fnName')
  // 分发actions的方法
  store.dispatch('fnName')
</script>

<script setup>
  import api from '../api/Api'
  const data = await Api.getData()
  console.log(data)
</script>

<template>
  <AdoutExe />
</template>
 
<script setup>
  import { ref,provide } from 'vue'
  import AdoutExe from '@/components/AdoutExeCom'
 
  let name = ref('Jerry')
  // 使用provide
  provide('provideState', {
    name,
    changeName: () => {
      name.value = '小叮当'
    }
  })
</script>
子组件代码如下（示例）：
<script setup>
  import { inject } from 'vue'
  const provideState = inject('provideState')
 
  provideState.changeName()
</script>