Vue102 vue3 provide和inject 祖与后代组件间通信

笔记

• 作用：实现祖与后代组件间通信

• 套路：父组件有一个 provide 选项来提供数据，后代组件有一个 inject 选项来开始使用这些数据

• 具体写法：

  1. 祖组件中：

     setup(){
             
             
     	......
         let car = reactive({
             
             name:'奔驰',price:'40万'})
         provide('car',car)
         ......
     }
     

  2. 后代组件中：

     setup(props,context){
             
             
     	......
         const car = inject('car')
         return {
             
             car}
     	......
     }
     

代码

App.vue

<template>
	<div class="app">
		<h3>我是App组件（祖），{
   
   {name}}--{
   
   {price}}</h3>
		<Child/>
	</div>
</template>

<script>
	import {
      
       reactive,toRefs,provide } from 'vue'
	import Child from './components/Child.vue'
	export default {
      
      
		name:'App',
		components:{
      
      Child},
		setup(){
      
      
			let car = reactive({
      
      name:'奔驰',price:'40W'})
			provide('car',car) //给自己的后代组件传递数据
			return {
      
      ...toRefs(car)}
		}
	}
</script>

<style>
	.app{
      
      
		background-color: gray;
		padding: 10px;
	}
</style>

Child.vue

<template>
	<div class="child">
		<h3>我是Child组件（子）</h3>
		<Son/>
	</div>
</template>

<script>
	import {
      
      inject} from 'vue'
	import Son from './Son.vue'
	export default {
      
      
		name:'Child',
		components:{
      
      Son},
		/* setup(){
			let x = inject('car')
			console.log(x,'Child-----')
		} */
	}
</script>

<style>
	.child{
      
      
		background-color: skyblue;
		padding: 10px;
	}
</style>

Son.vue

<template>
	<div class="son">
		<h3>我是Son组件（孙），{
   
   {car.name}}--{
   
   {car.price}}</h3>
	</div>
</template>

<script>
	import {
      
      inject} from 'vue'
	export default {
      
      
		name:'Son',
		setup(){
      
      
			let car = inject('car')
			return {
      
      car}
		}
	}
</script>

<style>
	.son{
      
      
		background-color: orange;
		padding: 10px;
	}
</style>