vue中setup语法糖写法实例

<script>
import {useStore} from 'vuex'
export default {
  setup() {
    const store=useStore()
    const plus=()=>{
      store.commit('plus')
    }
    return {plus}
  },
}
</script>

<script setup>
import { reactive, ref, toRefs } from "vue";
let num = ref(100);
const plus = ()=>{
  num.value++;
}
let {name,age} = toRefs(reactive({
  name:"张三",
  age:20,
}));
</script>

<template>
  <div>
    {{name}}--{{age}}
    <el-button @click="plus">Plus</el-button>
    <son/>
  </div>
</template>
<script setup>
import { reactive, ref, toRefs } from "vue";
import son from "../components/Son.vue"
let num = ref(100);
const plus = ()=>{
  num.value++;
}
let {name,age} = toRefs(reactive({
  name:"张三",
  age:20,
}));
</script>

<template>
    <div>
      {{name}}--{{age}}
      <Son :num="age" :name='name' />
    </div>
  </template>
  <script setup>
  import { reactive, ref, toRefs } from "vue";  
  import Son from "./Son.vue"
  let {name,age} = toRefs(reactive({
    name:"张三",
    age:20,
  }));
  </script>

<template>
    <div>
        <h3>Son子组件--{{num}}--{{name}}</h3>       
    </div>
</template>
<script setup>
import { ref,defineEmits } from "vue"
defineProps({
    num:{
        type:Number,
    },
    name:{
        type:String,
    }
})
</script>

<template>
    <div>
      <Son @plus="plus"/>
    </div>
  </template>
  <script setup>
  import { reactive, ref, toRefs } from "vue";
  import Son from "./Son.vue"
  let num = ref(100);
  const plus = ()=>{
    num.value++;
  }
  </script>

<template>
    <div>
        <button @click="add">点我</button>
    </div>
</template>
<script setup>
import { ref,defineEmits } from "vue"
const num=ref(1)
const emits = defineEmits(['num'])//定义号要子传父
const add=()=>{
    emits('plus',num.value)
}
</script>