效果

如图所示

实现

import { createRoot } from 'react-dom/client';
import React, { useState } from 'react';
import { Tree, Input, Button } from 'antd';
import { PlusOutlined } from '@ant-design/icons';

const { TreeNode } = Tree;
const { Search } = Input;

const initialData = [
  {
    title: 'Root Node',
    key: '0',
    children: [{
      title: ' Node',
    key: '1',
    }],
  },
];

const DynamicTree = () => {
  const [treeData, setTreeData] = useState(initialData);
  const [expandedKeys, setExpandedKeys] = useState(['0']);
  const [autoExpandParent, setAutoExpandParent] = useState(true);

  const onExpand = (expandedKeys) => {
    setExpandedKeys(expandedKeys);
    setAutoExpandParent(false);
  };

  const addNode = (key, title = 'New Node') => {
    const addNodeRecursively = (nodes) => {
      return nodes.map((node) => {
        if (node.key === key) {
          const newNode = {
            title,
            key: `${key}-${node.children ? node.children.length : 0}`,
            children: [],
          };
          return {
            ...node,
            children: [...node.children, newNode],
          };
        } else if (node.children) {
          return {
            ...node,
            children: addNodeRecursively(node.children),
          };
        }
        return node;
      });
    };

    setTreeData((prevData) => addNodeRecursively(prevData));
    setExpandedKeys((prevKeys) => [...prevKeys, key]);
  };

  const renderTreeNodes = (data) =>
    data.map((item) => (
      <TreeNode title={item.title} key={item.key} dataRef={item}>
        {item.children ? renderTreeNodes(item.children) : null}
        <TreeNode
          title={
            <Button
              type="dashed"
              size="small"
              onClick={() => addNode(item.key)}
              icon={<PlusOutlined />}
            >
              Add Child
            </Button>
          }
          key={`${item.key}-add`}
        />
      </TreeNode>
    ));

  return (
    <div>
      <Tree
        showIcon
        onExpand={onExpand}
        expandedKeys={expandedKeys}
        autoExpandParent={autoExpandParent}
      >
        {renderTreeNodes(treeData)}
      </Tree>
    </div>
  );
};

export default DynamicTree;

const ComponentDemo = DynamicTree;


createRoot(mountNode).render(<ComponentDemo />);

进一步增强实现

同层级可以拖拽
增加节点的节点始终放在最后且可以增加同级节点
而且只有末级可以增加

import { createRoot } from 'react-dom/client';
import React, { useState } from 'react';
import { Tree, Button } from 'antd';
import { PlusOutlined } from '@ant-design/icons';

const { TreeNode } = Tree;

const initialData = [
  {
    title: 'Root Node',
    key: '0',
    children: [],
  },
];

const DynamicTree = () => {
  const [treeData, setTreeData] = useState(initialData);
  const [expandedKeys, setExpandedKeys] = useState(['0']);
  const [autoExpandParent, setAutoExpandParent] = useState(true);

  const onExpand = (expandedKeys) => {
    setExpandedKeys(expandedKeys);
    setAutoExpandParent(false);
  };

  const addNode = (key, title = 'New Node') => {
    const addNodeRecursively = (nodes) => {
      return nodes.map((node) => {
        if (node.key === key) {
          const newNode = {
            title:`${title}-${key}-${node.children ? node.children.length : 0}`,
            key: `${key}-${node.children ? node.children.length : 0}`,
            children: [],
          };
          return {
            ...node,
            children: [...node.children, newNode],
          };
        } else if (node.children) {
          return {
            ...node,
            children: addNodeRecursively(node.children),
          };
        }
        return node;
      });
    };

    setTreeData((prevData) => addNodeRecursively(prevData));
    setExpandedKeys((prevKeys) => [...prevKeys, key]);
  };

  const renderTreeNodes = (data, level = 0) =>
    data.map((item) => (
      <TreeNode title={item.title} key={item.key} dataRef={item}>
        {item.children ? renderTreeNodes(item.children, level + 1) : null}
        {level < 1 && (
          <TreeNode
            selectable={false}
            disabled={true}
            icon={<PlusOutlined />}
            title={
              <Button
                type="dashed"
                size="small"
                onClick={() => addNode(item.key)}
                icon={<PlusOutlined />}
              >
                Add Child
              </Button>
            }
            key={`${item.key}-add`}
          />
        )}
      </TreeNode>
    ));

  const onDrop = (info) => {
    const dropKey = info.node.key;
    const dragKey = info.dragNode.key;
    const dropPos = info.node.pos.split('-');
    const dropPosition = info.dropPosition - Number(dropPos[dropPos.length - 1]);
    const loop = (data, key, callback) => {
      data.forEach((item, index, arr) => {
        if (item.key === key) {
          return callback(item, index, arr);
        }
        if (item.children) {
          return loop(item.children, key, callback);
        }
      });
    };

    const data = [...treeData];
    let dragNode;
    // Find dragObject
    loop(data, dragKey, (item, index, arr) => {
      arr.splice(index, 1);
      dragNode = item;
    });

    if (!info.dropToGap) {
      // Drop on the content
      loop(data, dropKey, (item) => {
        item.children = item.children || [];
        // where to insert 示例添加到头部，可以是随意位置
        item.children.unshift(dragNode);
      });
    } else if (
      (info.node.children || []).length > 0 && // Has children
      info.node.expanded && // Is expanded
      dropPosition === 1 // On the bottom gap
    ) {
      loop(data, dropKey, (item) => {
        item.children = item.children || [];
        // where to insert 示例添加到头部，可以是随意位置
        item.children.unshift(dragNode);
      });
    } else {
      let ar;
      let i;
      loop(data, dropKey, (item, index, arr) => {
        ar = arr;
        i = index;
      });
      if (dropPosition === -1) {
        ar.splice(i, 0, dragNode);
      } else {
        ar.splice(i + 1, 0, dragNode);
      }
    }

    setTreeData(data);
  };

  return (
    <div>
      <Tree
        draggable
        onExpand={onExpand}
        expandedKeys={expandedKeys}
        autoExpandParent={autoExpandParent}
        onDrop={onDrop}
      >
        {renderTreeNodes(treeData)}
      </Tree>
    </div>
  );
};

export default DynamicTree;


const ComponentDemo = DynamicTree;


createRoot(mountNode).render(<ComponentDemo />);