element-给el-tree的最外面一级节点添加图片

        <el-tree :data="storeList" style="margin-top: -0px;" row-key="eqStoreId" @node-click="storehandleNodeTree"
          :default-expand-all="true" :props="defaultProps" :expand-on-click-node="false">
          <template v-slot="{ node, data }">
            <span v-if="data.ancestors == 0" class="custom-node">
              <img src="../assets/homepageImage/iocn.png" class="custom-icon">
              <span>{{ data.storeName }}</span>
            </span>
            <span v-else>
              {{ data.storeName }}
            </span>
          </template>
        </el-tree>

ancestors是最外面一层节点的标识