开发react树形组件的初衷是使其自定义更方便与自己的业务更切合，使其样式、功能交互更多元化，随业务随意修改。

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直接上代码：
js代

import styles from './index.less'
import React, { Component } from 'react';

class TreeComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      expandedNodes: [], // 用于存储展开的节点
    };
  }

  toggleNode = (nodeId) => {
    const { expandedNodes } = this.state;
    const isExpanded = expandedNodes.includes(nodeId);

    if (isExpanded) {
      this.setState({
        expandedNodes: expandedNodes.filter((key) => key !== nodeId),
      });
    } else {
      this.setState({
        expandedNodes: [...expandedNodes, nodeId],
      });
    }
  };

  renderTree = (nodes, level = 0) => {
    return nodes.map((node) => {
      // 每一节点收缩
      const isExpanded = this.state.expandedNodes.includes(node.key);
      // 每一级是否有子节点
      const hasChildren = node.children && node.children.length > 0;
      // 是否是最后一级
      const isLastLevel = node.children?false:true
      // 节点数
      const number = node.children && node.children.length
      return (
        <div key={node.id}>
          <div style={{ paddingLeft: level * 115 }}>
            {<div className={styles['queryTree-TreeNode-name']}>
                <div className={`${styles['queryTree-TreeNode-name-text']} 
                    ${level===0?styles['one-text']:isLastLevel?styles['end-text']:''}`} >
                      {/* 连线 竖线*/}
                        {
                          new Array(level).fill(level).map((item,index)=>
                          <span key={index} style={{left:`${-115*(index) + 24}px`}} className={styles['queryTree-TreeNode-name-line-p']}>
                            <span className={styles['queryTree-TreeNode-name-line-expanded']}></span>
                          </span>
                          )
                        }
                        {/* 连线 横线子节点线*/}
                       {level!==0&&
                        <span className={styles['queryTree-TreeNode-name-line-f']}>
                          <span className={styles['queryTree-TreeNode-name-line']}></span>
                        </span>
                      }
                        {/*名字 和节点数 */}
                    <div className={styles['text-width']} > 
                      <span className={styles['text-width-span']}>
                      {node.title} {number?'('+number+')':''}
                      </span>
                      {/* 收缩 按钮 */}
                    {hasChildren&&(
                    <div onClick={() => this.toggleNode(node.key)} className={styles['treeNode-shrink']}>
                        {isExpanded ? '-' : '+'}
                    </div>
                    )}
                    {isLastLevel && (
                        <a >
                          详情
                        </a>
                    )}
                    </div>
                </div>
            </div> }
          </div>
          {/* 展开时加载子节点 */}
          {isExpanded && hasChildren && (
            <div style={{  }}>
              {this.renderTree(node.children, level + 1)}
            </div>
          )}
          
        </div>
      );
    });
  };

  render() {
    // const { data } = this.props;
    const data = [
      {
        title: 'parent 1',
        key: '0-0',
        children: [
          {
            title: 'parent 1-0',
            key: '0-0-0',
            children: [
              {
                title: 'leaf',
                key: '0-0-0-0',
              },
              {
                title: 'leaf',
                key: '0-0-0-1',
              },
              {
                title: 'leaf',
                key: '0-0-0-2',
              },
            ],
          },
          {
            title: 'parent 1-1',
            key: '0-0-1',
            children: [
              {
                title: 'leaf',
                key: '0-0-1-0',
              },
            ],
          },
          {
            title: 'parent 1-2',
            key: '0-0-2',
            children: [
              {
                title: 'leaf',
                key: '0-0-2-0',
              },
              {
                title: 'leaf',
                key: '0-0-2-1',
              },
            ],
          },
        ],
      },
    ];
    // const loadStartTime = performance.now(); //
    return <div className={styles['queryTree-TreeNode']}>
        {
            this.renderTree(data)
        }
        {/* {

 performance.now() - loadStartTime 

        } */}
    </div>;
   
  }
}

export default TreeComponent;

index.less代码:

 queryTree-TreeNode{
        position: relative;
        height: 500px;
        width: 1338px;
        overflow: auto;
        &-name{
          display: flex;
          justify-items: center;
          align-items: center;
          &-text{
            display: flex;
            justify-content:space-between ;
            justify-items: center;
            align-items: center;
            .text-width{
              width: 230px;
            display: flex;
            justify-content:space-between ;
            justify-items: center;
            background: rgba(11,78,149,0.5);
            border: 1px solid #227EF0;
            border-radius: 5px;
            margin-top: 5px;
             &-span{
              
                padding: 5px;
                width: 190px;
                display: block;
              }
              
            }
          }
          .end-text{
            .text-width{
              border: none;
              border-left:1px solid #1B8AFF ;
              .text-width-span{
                border: none;
                border-radius: 5px;
                border-left:3px solid #1B8AFF ;
              }
            }
          }
          .treeNode-shrink{
            display: flex;
            justify-content:center ;
            align-items: center;
            align-self: center;
            width: 20px;
            height: 20px;
            line-height: 20px;
            background: rgba(27,138,255,0.5);
            border-radius: 50%;
            cursor: pointer;
            margin-right: 3px;
          }
          &-line-f,&-line-p{
            position: relative;
            flex: none;
            align-self: stretch;
            width: 24px;
            margin: 0;
            line-height: 24px;
            text-align: center;
            user-select: none;
          }
          &-line,&-line-expanded{
            position: relative;
            z-index: 1;
            display: inline-block;
            width: 100%;
            height: 100%;
          }
          &-line:before,&-line-expanded::before{
            position: absolute;
            top: 0;
            inset-inline-end: 12px;
            bottom: -4px;
            margin-inline-start: -1px;
            border-inline-end: 1px solid #8AC5ED;
            content: "";
          }
          &-line:after{
            position: absolute;
            width: 10px;
            height: 50%;
            border-bottom: 1px solid #8AC5ED;
            content: "";
          }
          &-line-p{
            width: 0px;
          }
          &-line-expanded{
          }
          &-line-expanded::before{

          }
         
          .one-text{
            // width: 40px;
            // height: 100%;
            // background: rgba(11,78,149,0.5);
            // border: 1px solid #227EF0;
            // border-radius: 5px;
            
          }
          
          a{
            text-decoration:underline;
            color: #00A6FF;
            display: block;
            width:32px;
            padding-top: 5px;
          }
        }
        
      }