vue3 composition api用法（vue3中provide和inject的使用）

<template>
  <erzi-com></erzi-com>
</template>
<script lang="ts">
import ErZi  from "../components/ErZi.vue"
import {provide, ref} from "vue"
export default {
  name:"About",
  components:{
    'erzi-com':ErZi
  },
  setup(){
    let giveSunziData=ref({
       with:100,
       height:50,
       bg:'pink'
    })
    // 第一个参数是是共享数据的名称(giveSunzi)
    // 第二个参数是共享的数据(giveSunziData)
    provide('giveSunzi',giveSunziData)
  }
}
</script>

<template>
    <li>
      <h2>儿子组件</h2>
      <li>得到的值：{{getFaytherData}}</li>
    </li>
    <hr/>
    <sun-con></sun-con>
</template>
<script lang="ts">
import { defineComponent, inject } from 'vue';
import SunZI from "./SunZI.vue"
export default defineComponent({
  name: 'ErZi',
   components:{
     'sun-con':SunZI
   },
    setup(){
      let getFaytherData=inject('giveSunzi');
      return { getFaytherData }
    }
});
</script>

<template>
    <li>
         <h2>孙子组件</h2>
         <li>得到的值{{getYeYeData}}</li>
    </li>
</template>
<script lang="ts">
import { defineComponent,inject } from 'vue';
export default defineComponent({
   setup(){
     let getYeYeData=inject('giveSunzi');
    return { getYeYeData }
   }
});
</script>