ElemeFE / ElemeFE/element

[Bug Report] Table 表格的TreeNode节点,如何获取Tree节点层信息?

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Description

### Element UI version
2.15.7

### OS/Browsers version
Chrome 浏览器

### Vue version
2.6.14

### Reproduction Link
https://codepen.io/pen/?&prefill_data_id=e3b7ac4b-78a6-4bd8-92db-c5314b01b6de

### Steps to reproduce
Table 表格的TreeNode使用方式;怎么在列表已渲染完成的情况下,获取当前选中节点的Children进行动态更新子节点列表呢?https://element.eleme.io/2.15/#/zh-CN/component/table

### What is Expected?
更新表格树;类似于Tree控件的https://element.eleme.io/2.15/#/zh-CN/component/tree的作用,动态更新指定节点下的Children集合信息,还有更新整个Tree的节点信息

### What is actually happening?
load表属性的第二个参数,每次打开进行请求子节点列表,渲染完也是空的;未提供根据选中的key值获取指定的TreeNode节点信息,动态更新子集合列表

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