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el-tree-v2无 el-tree中默认展开节点的属性，需要自行设置

需求：首次默认展开全部节点

实现1尝试失败：增加设置了属性 :default-expand-keys="props.treeData.map(item=item.id)"无效，但是静态数据:default-expand-keys="[1]"指定id就可以展开，原因应该是数据视图更新导致，但是未找到好的解决方法。

如下实现：

1-设置了firstExpand为首次加载标志

2-判断为第一次加载，是就setExpandedKeys设置默认展开

<script lang="ts" setup>import {  ElTree } from "element-plus";import { ref, watch, onMounted, nextTick } from "vue";//动态设置的高度const { tableBox, tableHeight } = useDynamicTableHeight();const defaultProps = {children: 'peopleData',value: 'id'}// 传给父组件点击事件const emits = defineEmits(['clickMapTerminal']);// 点击const onClickMapTerminal = (data) => {}const props = defineProps({treeData: {type: Array,default: () => {return []}}})const treeRef = ref < InstanceType < typeof ElTree >> ();//第一次加载标记const firstExpand = ref < boolean > (true);//监听第一次加载就默认展开全部节点watch(() => props.terminalData, () => {if (!firstExpand.value) return;setExpandedKeys();firstExpand.value = false;}, { deep: true })//默认全部展开——设置当前展开的节点const setExpandedKeys = () => {const allChooseIds = props.treeData.map(item => item.id) || [];treeRef.value?.setExpandedKeys(allChooseIds);}
</script><template><div id="list" class="overflow-y-auto h-full"><el-scrollbar class="w-full flex-1 h-full border-[1px] grow border-[#F0F0F0]" ref="tableBox"><el-tree-v2 ref="treeRef" :height="tableHeight" :data="props.treeData" :props="defaultProps" node-key="id" :expand-on-click-node="true" :item-size="45" default-expand-all @node-click="onClickMapTerminal"><template #default="{ node, data }"></template></el-tree-v2></el-scrollbar></div>
</template>