借鉴ant react的做法

在upload 组件外加一个key 赋随机值，即可清除缓存

完整代码 

通过监听弹窗modal 的开闭状态 更改key的值，建议关闭状态时更改为随机key ，避免影响操作效果

  <a-modal v-model="visible" title="AddComponents" @ok="handleOk">
        <a-form-model-item label="Image">
          <div :key="ImgKey">
            <imgUpload
              @uploadFileList="uploadFileList"
              model="moudleImg"
              :isOpen="isOpen"
              :file="fileList"
            ></imgUpload>
          </div>
        </a-form-model-item>
      </a-form-model>
    </a-modal>

export default {
  data() {
    return {
      visible: false,
      ImgKey: ''
    }
  },
  watch: {
    visible() {
      if (this.visible) {
        this.ImgKey = ''
      } else {
        this.ImgKey = Math.random()
      }
      console.log('this.ImgKey :>> ', this.ImgKey)
    },
  },
}