Vue组件高级通讯之$attrs与$listeners

<template>
  <div class="app">
    <h3>我是爷爷组件</h3>
    <Parent  :data1="data1" :data2="data2" :data3="data3" @fun1="fun1" @fun2="fun2"></Parent>
  </div>
</template>
<script>
import Parent from './components/Parent.vue'
export default {
  name: "App",
  components: {
    Parent
  },
  data() {
    return {
      data1: '数据1',
      data2: '数据2',
      data3: '数据3'
    }
  },
  methods: {
    fun1(val) {
      console.log('通过子组件触发', val);
    },
    fun2(val) {
      console.log('通过子组件触发', val);
    }
  }
}
</script>

<template>
  <div class="parent">
    <h3>我是父组件</h3>
    <Son v-bind="$attrs" v-on="$listeners"></Son>
  </div>
</template>
<script>
import Son from './Son'
export default {
//禁用将数据显示在组件根元素的默认操作
  inheritAttrs: false,
  name: 'Parent',
  props: {
    data1: {
      type: String,
      default: ''
    }
  },
  components: {
    Son
  },
  created() {
    console.log(this.$attrs, this.$listeners, 'this.$attrs,this.$listeners');  //data2: "数据2", data3: "数据3",fun1, fun2
  },
}
</script>

<template>
  <div class="son">
    <h3>我是子组件</h3>
    这是爷爷的数据{{user}} <br>
    这是自己的数据{{myUser}}<br>
    <button @click="toParent">传递数据给父组件</button>
  </div>
</template>
<script>
import Son from './Son'
export default {
  name: 'Son',
  components: {
    Son
  },
  props: {
  //接收父组件的数据
    data2: {
      type: String,
      default: ''
    },
    data3: {
      type: String,
      default: ''
    }
  },
  created() {
    console.log(this.data2, this.data3, '$attrs');
  },
  methods: {
    toParent() {
    //触发父组件的方法
      this.$emit('fun1', '我是孙组件数据')
    }
  }
}
</script>