一起来学习Vue的组件间通信方式

props: {
    // 基础类型检测 (`null` 意思是任何类型都可以)
    propA: Number,
    // 多种类型
    propB: [String, Number],
    // 必传且是字符串
    propC: {
      type: String,
      required: true
    },
    // 数字，有默认值
    propD: {
      type: Number,
      default: 100
    },
    // 数组/对象的默认值应当由一个工厂函数返回
    propE: {
      type: Object,
      default: function () {
        return { message: 'hello' }
      }
    },
    // 自定义验证函数
    propF: {
      validator: function (value) {
        return value > 10
      }
    }
  }

<template>
    <children @addCount="addCount" :count="count"/>
<template>
<script>
  import children from "./children";
  export default {
    name:'index',
    components: {Children},
    data () {
      return {
        count:0
      }
    },
    methods:{
      addCount(data){
        this.count = data.count;
      }
    }
  }
</script>

<template>
  <div>
    <h3>计数器:{{count}}</h3> 
    <button @click='add'>+++</button>
  </div>
</template>
<script>
  export default {
    name:'children',
    props:['count'], // 用来接收父组件传给子组件的数据
    methods:{
      add() {
        // 触发父组件的方法
        this.$emit('addCount',{count: count + 1});
      }
    }
  }
</script>

<template>
   <div>
        <span>{{count}}</span>
        <children/>
   </div>
<template>
<script>
  import { bus } from '../main.js';  
  import children from "./children";
  export default {
    name:'index',
    components: {Children},
    data () {
      return {
        count:0
      }
    },
    mounted(){
        bus.$on('addCount',(val)=>{
            this.count++;
        })
    }
  }
</script>

<template>
    <button @click='add'>count+++</button>
</template>
<script>
import { bus } from '../main.js';
export default {
    name:'children',
    methods:{
      add() {
        // 触发父组件的方法
        bus.$emit('addCount',{});
      }
    }
}
</script>

export var bus = new Vue();

<template>
    <button @click='actionParent'>触发父组件发方法</button>
</template>
<script>
export default {
    name:'children',
    methods:{
      actionParent() {
        console.log(this.$parent.name);
        this.$parent.parentPrint(); // 触发父组件的方法
      }
    }
}
</script>

for(let i=0; i<this.$children.length; i++){
    console.log(this.$children[i].name); // 输出子组件的name
}

<template>
    <div>
       <div ref="testDom">123</div>
       <child ref="child" />
       <button @click="openChild" >触发子组件</button>
    </div>
</template>
<script>
import Child fORM './child.vue'
export default {
    components:{
        Child
    },
    
    mounted(){
        console.log(this.$refs.testDom) // <div>123</div>
        console.log(this.$refs.child.name) // 粉刷匠
    },
    methods:{
        openChild(){
            this.$refs.child.open();
        }
    }
    
}
</script>

<template>
   <div>{{name}}</div>
</template>
<script>
export default {
   data(){
      return {
        name:"粉刷匠"
      }
   },
   methods:{
        open(){
            alter("点击了")
        }
   }
}
</script>

<template>
	<div class="test">
		<son prop="data"></son>
	</div>
</template>
 
<script>
export default {
	name: 'Father',
	provide: {
		chontrol: this
	}
    data(){
        return {
            name:"啊哈哈"
        }
    }
}

<template>
	<div>
		{{name}}
	</div>
</template>
 
<script>
export default {
	name: 'son',
	inject: ["chontrol"]
    props: {
        name: {
          type: Object,
          default: () => ({}),
        },
    }    
  },
}
</script>