组件通信_方式1_props
作用：
若父传子，属性值是飞函数
若子传父，属性值是函数
Parent.vue
html
<template>
<div class="father">
<h3>父组件</h3>
<h4>汽车：{{ car }}</h4>
<h4 v-show="toy">子给的玩具：{{ toy }}</h4>
<Child :car="car" :sendToy="getToy" :aa="bb"/>
</div>
</template>
typescript
<script setup lang="ts" name="Father">
import Child from './Child.vue'
import {ref} from 'vue'
// 数据
let car = ref('奔驰')
let toy = ref('')
let bb = ref(0)
// 方法
function getToy(value:string){
toy.value = value
}
</script>Child.vue
html
<template>
<div class="child">
<h3>子组件</h3>
<h4>玩具：{{ toy }}</h4>
<h4>父给的车：{{ car }}</h4>
<h4>其它{{$attrs}}</h4>
<button @click="sendToy(toy)">把玩具给父亲</button>
</div>
</template>
javascript
<script setup lang="ts" name="Child">
import {ref} from 'vue'
// 数据
let toy = ref('奥特曼')
// 声明接收props
defineProps(['car','sendToy'])
</script>组件通信_方式2_自定义事件
作用：子传父
Parent.vue
html
<template>
<div class="father">
<h3>父组件</h3>
<h4 v-show="toy">子给的玩具：{{ toy }}</h4>
<!-- 给子组件Child绑定事件 -->
<Child @send-toy="saveToy"/>
</div>
</template>
typescript
<script setup lang="ts" name="Father">
import Child from './Child.vue'
import { ref } from "vue";
// 数据
let toy = ref('')
// 用于保存传递过来的玩具
function saveToy(value:string){
toy.value = value
}
</script>Child.vue
html
<template>
<div class="child">
<h3>子组件</h3>
<h4>玩具：{{ toy }}</h4>
<button @click="emit('send-toy', toy)">测试</button>
</div>
</template>
typescript
<script setup lang="ts" name="Child">
import { ref, onMounted } from "vue";
// 数据
let toy = ref('奥特曼')
// 声明事件
const emit = defineEmits(['send-toy'])
</script>组件通信_方式3_mitt
作用：任意组件间通信
安装：npm i mitt
创建utils/emitter文件
emitter.ts文件
typescript
// 引用
import mitt from "mitt";
// 调用emitter，emitter能够绑定事件，触发事件
const emitter = mitt()
export default emitterChild1.vue
html
<template>
<div class="child1">
<h3>子组件1</h3>
<h4>玩具：{{ toy }}</h4>
<button @click="emitter.emit('send-toy',toy)">玩具给弟弟</button>
</div>
</template>
typescript
<script setup lang="ts" name="Child1">
import {ref} from 'vue'
import emitter from '@/utils/emitter';
// 数据
let toy = ref('奥特曼')
</script>Child2.vue
html
<template>
<div class="child2">
<h3>子组件2</h3>
<h4>电脑：{{ computer }}</h4>
<h4>哥哥给的玩具：{{ toy }}</h4>
</div>
</template>
typescript
<script setup lang="ts" name="Child2">
import {ref,onUnmounted} from 'vue'
import emitter from '@/utils/emitter';
// 数据
let computer = ref('联想')
let toy = ref('')
// 给emitter绑定send-toy事件
emitter.on('send-toy',(value:any)=>{
toy.value = value
})
// 在组件卸载时解绑send-toy事件
onUnmounted(()=>{
emitter.off('send-toy');//在组件卸载时解绑
emitter.all.clear();//清除总线上绑定的所有事件
})
</script>v-model
html
<template>
<div class="father">
<h3>父组件</h3>
<h4>{{ username }}</h4>
<h4>{{ password }}</h4>
<!-- v-model用在html标签上 -->
<!-- <input type="text" v-model="username"> -->
<!-- <input type="text" :value="username" @input="username = (<HTMLInputElement>$event.target).value"> -->
<!-- v-model用在组件标签上 -->
<!-- <AtguiguInput v-model="username"/> -->
<!-- <AtguiguInput
:modelValue="username"
@update:modelValue="username = $event"
/> -->
<!-- 修改modelValue -->
<AtguiguInput v-model:ming="username" v-model:mima="password"/>
</div>
</template>
<script setup lang="ts" name="Father">
import { ref } from "vue";
import AtguiguInput from './AtguiguInput.vue'
// 数据
let username = ref('zhansgan')
let password = ref('123456')
</script>AtguiguInput.vue
html
<template>
<input
type="text"
:value="ming"
@input="emit('update:ming',(<HTMLInputElement>$event.target).value)"
>
<br>
<input
type="text"
:value="mima"
@input="emit('update:mima',(<HTMLInputElement>$event.target).value)"
>
</template>
typescript
<script setup lang="ts" name="AtguiguInput">
defineProps(['ming','mima'])
const emit = defineEmits(['update:ming','update:mima'])
</script>组件通信_方式5_$attrs
作用：祖传孙、孙传祖
Parent.vue
html
<template>
<div class="father">
<h3>父组件</h3>
<h4>a：{{a}}</h4>
<h4>b：{{b}}</h4>
<h4>c：{{c}}</h4>
<h4>d：{{d}}</h4>
<Child :a="a" :b="b" :c="c" :d="d" v-bind="{x:100,y:200}" :updateA="updateA"/>
</div>
</template>
typescript
<script setup lang="ts" name="Father">
import Child from './Child.vue'
import {ref} from 'vue'
let a = ref(1)
let b = ref(2)
let c = ref(3)
let d = ref(4)
function updateA(value:number){
a.value += value
}
</script>Child.vue
html
<template>
<div class="child">
<h3>子组件</h3>
<GrandChild v-bind="$attrs"/>
</div>
</template>
typescript
<script setup lang="ts" name="Child">
import GrandChild from './GrandChild.vue'
</script>GrandChild .vue
html
<template>
<div class="grand-child">
<h3>孙组件</h3>
<h4>a：{{ a }}</h4>
<h4>b：{{ b }}</h4>
<h4>c：{{ c }}</h4>
<h4>d：{{ d }}</h4>
<h4>x：{{ x }}</h4>
<h4>y：{{ y }}</h4>
<button @click="updateA(6)">点我将爷爷那的a更新</button>
</div>
</template>
typescript
<script setup lang="ts" name="GrandChild">
defineProps(['a','b','c','d','x','y','updateA'])
</script>组件通信_方式6_ r e f s 与 refs与 refs与parent
$refs父传子
$parent子传父
Father.vue
html
<template>
<div class="father">
<h3>父组件</h3>
<h4>房产：{{ house }}</h4>
<button @click="changeToy">修改Child1的玩具</button>
<button @click="changeComputer">修改Child2的电脑</button>
<button @click="getAllChild($refs)">让所有孩子的书变多</button>
<Child1 ref="c1"/>
<Child2 ref="c2"/>
</div>
</template>
typescript
<script setup lang="ts" name="Father">
import Child1 from './Child1.vue'
import Child2 from './Child2.vue'
import { ref,reactive } from "vue";
let c1 = ref()
let c2 = ref()
// 数据
let house = ref(4)
// 方法
function changeToy(){
c1.value.toy = '小猪佩奇'
}
function changeComputer(){
c2.value.computer = '华为'
}
function getAllChild(refs:{[key:string]:any}){
console.log(refs)
for (let key in refs){
refs[key].book += 3
}
}
// 向外部提供数据
defineExpose({house})
</script>Child1.vue
html
<template>
<div class="child1">
<h3>子组件1</h3>
<h4>玩具：{{ toy }}</h4>
<h4>书籍：{{ book }} 本</h4>
<button @click="minusHouse($parent)">干掉父亲的一套房产</button>
</div>
</template>
typescript
<script setup lang="ts" name="Child1">
import { ref } from "vue";
// 数据
let toy = ref('奥特曼')
let book = ref(3)
// 方法
function minusHouse(parent:any){
parent.house -= 1
}
// 把数据交给外部
defineExpose({toy,book})
</script>组件通信_方式7_provide_inject
作用：祖传子
Father.vue
html
<template>
<div class="father">
<h3>父组件</h3>
<h4>银子：{{ money }}万元</h4>
<h4>车子：一辆{{car.brand}}车，价值{{car.price}}万元</h4>
<Child/>
</div>
</template>
typescript
<script setup lang="ts" name="Father">
import Child from './Child.vue'
import {ref,reactive,provide} from 'vue'
let money = ref(100)
let car = reactive({
brand:'奔驰',
price:100
})
function updateMoney(value:number){
money.value -= value
}
// 向后代提供数据
provide('moneyContext',{money,updateMoney})
provide('car',car)
</script>GrandChild.vue
html
<template>
<div class="grand-child">
<h3>我是孙组件</h3>
<h4>银子：{{ money }}</h4>
<h4>车子：一辆{{car.brand}}车，价值{{car.price}}万元</h4>
<button @click="updateMoney(6)">花爷爷的钱</button>
</div>
</template>
typescript
<script setup lang="ts" name="GrandChild">
import { inject } from "vue";
let {money,updateMoney} = inject('moneyContext',{money:0,updateMoney:(param:number)=>{}})
let car = inject('car',{brand:'未知',price:0})
</script>