el-tree는 상위 노드 앞에만 아이콘을 추가합니다.

<code class="javascript"><template>
  <el-tree :data="treeData">
    <span slot-scope="{ node, data }">
      <i v-if="data.isParent" class="el-icon-folder-opened"></i>
      {{ node.label }}
    </span>
  </el-tree>
</template>

<script>
export default {
  data() {
    return {
      treeData: [
        {
          label: 'Parent Node 1',
          children: [
            { label: 'Child Node 1' },
            { label: 'Child Node 2' },
          ],
        },
        {
          label: 'Parent Node 2',
          children: [
            { label: 'Child Node 3' },
            { label: 'Child Node 4' },
          ],
        },
      ],
    };
  },
};
</script></code>

<code class="html"><span slot-scope="{ node, data }">
  <i v-if="data.isParent" class="el-icon"></i>
  {{ node.label }}
</span></code>