<template>
 <div id="father">
 {{ '我是父组件' }}
 <son :text = "text"></son>
 </div>
</template>
<script>
import son from './son.vue'
export default {
 data: function () {
 return {
 text: '从父组件传来的数据'
 }
 },
 components: {
 son: son
 }
}
</script>
<style scoped>
</style> 

<template>
 <div>
 {{ '我是子组件，我接收了' + text }}
 </div>
</template>
<script>
export default {
 props: {
 text: { type: String, default: '' }
 }
}
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
</style>

<template>
 <div id="father">
 {{ '我是父组件,名称是' + componentName }}
 <son :changeComponentName = "changeComponentName"></son>
 </div>
</template>
<script>
import son from './son.vue'
export default {
 data: function () {
 return {
 componentName: '组件A'
 }
 },
 methods: {
 changeComponentName: function (newComponentName) {
 this.componentName = newComponentName
 }
 },
 components: {
 son: son
 }
}
</script>
<style scoped>
 #father div{
 padding: 10px;
 margin: 10px;
 border: 1px solid gray;
 }
</style> 

<template>
 <div>
 <p>我是子组件：一个button</p>
 <button @click="() => changeComponentName(newComponentName)">
 把父组件的名称修改为：彭湖湾的组件
 </button>
 </div>
</template>
<script>
export default {
 data: function () {
 return {
 newComponentName: '彭湖湾的组件'
 }
 },
 props: {
 changeComponentName: {
 type: Function,
 default: () => { }
 }
 }
}
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
</style>

<template>
 <div id="father">
 <div>
 {{ '我是父组件,我的名称是:' + fatherComponentName }}
 <son v-on:changeComponentName = "changeComponentName"></son>
 </div>
 </div>
</template>
<script>
import son from './son.vue'
export default {
 data: function () {
 return {
 fatherComponentName: 'A组件'
 }
 },
 methods: {
 changeComponentName: function (componentName) {
 this.fatherComponentName = componentName
 }
 },
 components: {
 son: son
 }
}
</script>
<style scoped>
 #father div{
 padding: 10px;
 margin: 10px;
 border:1px solid grey;
 }
</style>

<template>
 <div>
 <p>我是子组件:一个按钮</p>
 <button @click="clickCallback">
 修改父组件的名称为：彭湖湾的组件
 </button>
 </div>
</template>
<script>
export default {
 data: function () {
 return {
 fatherComponentName: '彭湖湾的组件'
 }
 },
 methods: {
 clickCallback: function () {
 this.$emit('changeComponentName', this.fatherComponentName)
 }
 }
}
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
</style>

<template>
 <div id="father">
 <div>
 {{ '我是父组件:father' }}
 <eldest-son :text = "text"></eldest-son>
 <youngest-son :changeText="changeText"></youngest-son>
 </div>
 </div> 
</template>
<script>
import eldestSon from './eldestSon.vue'
import youngestSon from './youngestSon.vue'
export default {
 data: function () {
 return {
 text: '我是一行文本'
 }
 },
 methods: {
 changeText: function () {
 this.text = '我是经过改动的一行文本'
 }
 },
 components: {
 eldestSon: eldestSon,
 youngestSon: youngestSon
 }
}
</script>
<style>
 #father div{
 border: 1px solid grey;
 padding: 10px;
 margin: 10px;
 }
</style>

<template>
 <div>
 <p>我是兄弟组件：eldestSon</p>
 <p>我有一个可变数据text：{{ text }}</p>
 </div>
</template>
<script>
export default {
 props: {
 text: {
 type: String,
 default: ''
 }
 }
}
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
</style>

<template>
 <div>
 <p>我是兄弟组件：youngestSon</p>
 <button @click="changeText">更改eldestSon兄弟组件中的文本</button>
 </div>
</template>
<script>
export default {
 props: {
 changeText: {
 type: Function,
 default: () => {}
 }
 }
}
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
</style>