使用el-upload封装得组件怎么清空已上传附件

最近项目中一处附件上传，点击取消得时候要清空列表。因为本身附件上传组件已有删除，而这个取消按钮是不调用接口得。但是用组件属性就是会报错
，因此就让他局部刷新一下：

 <div class="file-info bdr10"
                   v-if="isRouterAlive">
                <!-- 1======课后作业            -->
                <upload-file-flex ref="upload"
                                  v-model="ruleForm.annex"
                                  @getFileList="getFileList"
                                  :accept="'.docx,.pdf'"
                                  :limit="1"></upload-file-flex>
              </div>
              <div class="text-center"
                   style="margin-top:10px">
                <el-button round
                           @click="removeFile"
                           size="mini">取消</el-button>
                <el-button type="primary"
                           size="mini"
                           :ldstatus="ldstatus"
                           style="background: #056AFF;"
                           @click="subMit"
                           round>保存</el-button>
              </div>

export default {
  name: "app",
  data() {
    return {
      isRouterAlive: true,
    };
  },
  provide() {
    return {
       removeFile: this.removeFile,
    };
  },
  methods: {
   removeFile () {
      this.isRouterAlive = false;
      this.$nextTick(function () {
        this.ruleForm.annex = ''
        this.isRouterAlive = true;
      });
    },
  },
};