表格树形数据展示可否异步获取子节点数据？

[loveFemi]

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What problem does this feature solve?

当表格中树形结构数据内容过多，嵌套层级很深时，数据量特别大，不知道有没有异步获取的方法？

What does the proposed API look like?

支持异步调用接口，获取当前节点下的子节点数据

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