treeselect默认选中节点

引用:在treeselect中，默认选中节点可以使用treeDefaultExpandedKeys属性来实现。 此属性可以设置要展开的节点的key值，只需将需要默认选中的节点的key值添加到treeDefaultExpandedKeys数组中即可。<span class="em">1</span><span class="em">2</span>
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