vue の親コンポーネントが子コンポーネントのメソッドとイベントを呼び出す

 fileClick(index) {
   console.log('子组件的fileClick被调用了')
   console.log('index:  '+index)
   // this.aaa();
   if(!this.fileInfor[index].imgUrl){
   //如果当前框里没有图片,则实现上传
   document.getElementsByClassName('upload_file')[index].click();
  }    
},

<template>
  <x-button type="submit" class="custom-primary" @click.native="xiechengUpload">上传图片</x-button>

  <up-load :fileInformation="fileInformation" ref="uploadRef"></up-load>
</template>

Upload(){
  // console.log('父组件的xiechengUpload被调用了')
  this.$refs.uploadRef.fileClick(0);
},

export default {
  mounted: function () {
   this.$nextTick(function () {
    this.$on('childMethod', function () {
     console.log('监听成功')
    })
   })
  }，
  methods {
    callMethod () {
     console.log('调用成功')
    }
  }
}

<child ref="child" @click="click"></child>
export default {
  methods: {
   click () {
   this.$refs.child.$emit(&#39;childMethod&#39;) // 方法1
   this.$refs.child.callMethod() // 方法2
  },
  components: {
   child: child
  }
}