fix: tree fieldNames for key error, close #4790

Author: tangjinzhou

components/tree/index.en-US.md

@@ -18,7 +18,7 @@ Almost anything can be represented in a tree structure. Examples include directo
 | Property | Description | Type | Default | Version |
 | --- | --- | --- | --- | --- |
 | treeData | treeNode of tree, please use `treeNodes` before v1.1.4 | [TreeNode[]](#TreeNode) | - |  |
-| replaceFields | Replace the title,key and children fields in treeNode with the corresponding fields in treeData | object | { children:'children', title:'title', key:'key' } |  |
+| fieldNames | Replace the title,key and children fields in treeNode with the corresponding fields in treeData | object | { children:'children', title:'title', key:'key' } | 3.0.0 |
 | autoExpandParent | Whether to automatically expand a parent treeNode | boolean | true |  |
 | blockNode | Whether treeNode fill remaining horizontal space | boolean | false |  |
 | checkable | Adds a `Checkbox` before the treeNodes | boolean | false |  |

components/tree/index.zh-CN.md

@@ -20,7 +20,7 @@ cover: https://gw.alipayobjects.com/zos/alicdn/Xh-oWqg9k/Tree.svg
 | --- | --- | --- | --- | --- | --- |
 | blockNode | 是否节点占据一行 | boolean | false |  |
 | treeData | treeNodes 数据，如果设置则不需要手动构造 TreeNode 节点（key 在整个树范围内唯一） | [TreeNode[]](#TreeNode) | -- |  |
-| replaceFields | 替换 treeNode 中 title,key,children 字段为 treeData 中对应的字段 | object | {children:'children', title:'title', key:'key' } |  |
+| fieldNames | 替换 treeNode 中 title,key,children 字段为 treeData 中对应的字段 | object | {children:'children', title:'title', key:'key' } | 3.0.0 |
 | autoExpandParent | 是否自动展开父节点 | boolean | true |  |
 | checkable | 节点前添加 Checkbox 复选框 | boolean | false |  |
 | checkedKeys(v-model) | （受控）选中复选框的树节点（注意：父子节点有关联，如果传入父节点 key，则子节点自动选中；相应当子节点 key 都传入，父节点也自动选中。当设置`checkable`和`checkStrictly`，它是一个有`checked`和`halfChecked`属性的对象，并且父子节点的选中与否不再关联 | string\[] \| number\[] \| {checked: string\[] \| number\[], halfChecked: string\[] \| number\[]} | \[] |  |

components/vc-tree/Tree.tsx

@@ -595,7 +595,7 @@ export default defineComponent({
 
     const onNodeCheck = (e: MouseEvent, treeNode: EventDataNode, checked: boolean) => {
       const { checkStrictly, onCheck } = props;
-      const { key } = treeNode;
+      const key = treeNode[fieldNames.value.key];
 
       // Prepare trigger arguments
       let checkedObj;