5.provide 与 inject
![](https://v3.cn.vuejs.org/images/components_provide.png)
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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:
-
祖组件中:
setup(){ ...... let car = reactive({name:'奔驰',price:'40万'}) provide('car',car) ...... }
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后代组件中:
setup(props,context){ ...... const car = inject('car') return {car} ...... }
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components
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>
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>
main.js
//引入的不再是Vue构造函数了,引入的是一个名为createApp的工厂函数
import { createApp } from 'vue'
import App from './App.vue'
//创建应用实例对象——app(类似于之前Vue2中的vm,但app比vm更“轻”)
const app = createApp(App)
//挂载
app.mount('#app')
标签:vue,provide,car,inject,Vue3,组件,import
From: https://www.cnblogs.com/chuixulvcao/p/17347385.html