<el-upload action="#" ref="upload" list-type="picture" :show-file-list="true" :limit="1" :http-request="handleUpload">
        <el-button size="small" type="primary">點選上傳</el-button>
      </el-upload>

上傳完成後執行清空

this.$refs.upload.clearFiles()

如果有多個元件可以使用：file-list

<el-upload action="#" ref="upload" :file-list="normal" list-type="picture" :show-file-list="true" :limit="1" :http-request="uploadAvatarNormal">
            <el-button size="small" type="primary">點選上傳圖片</el-button>
          </el-upload>
 

然後清空normal欄位即可