1.安装

npm i vue2-org-tree
npm install -D less-loader less

安装 less-loader出错解决办法，直接在package.json=》devDependencies下面加入less和less-loader版本，然后执行npm i
，我用的nodejs版本是 16.18.0，“webpack”: “^4.47.0”

2.demo

<template><div ref="appContainer" class="app-container"><div style="margin-left:30px;"><el-row :gutter="20"><el-col :span="5"><el-switch v-model="horizontal" :width="50" active-text="横排" inactive-text="竖排" style="margin-top:8px;"/></el-col></el-row></div><div style="font-size:12px;margin-top:30px;"><vue2-org-tree:data="treeData":horizontal="!horizontal"collapsable:render-content="renderContent"@on-expand="onExpand"@on-node-click="NodeClick"/></div></div>
</template><script>
export default {name: "TreeTest",data() {return {horizontal:true,treeData: {id: '0',label: "NBA季后赛",children: [{id: '1',label: "西部球队",children: [{id: '1-1',label: "勇士"},{id: '1-2',label: "火箭"},{id: '1-3',label: "太阳"},{id: '1-4',label: "小牛"}]},{id: '2',label: "东部球队",children: [{id: '2-1',label: "热火"},{id: '2-2',label: "雄鹿"},{id: '2-3',label: "骑士"},{id: '2-4',label: "凯尔特人"}]}]}}},created() {this.toggleExpand(this.treeData, true);},methods: {collapse(list) {list.forEach((child) => {if (child.expand) {child.expand = false;}child.children && this.collapse(child.children);});},onExpand(e, data) {console.log(data, 'data')if ("expand" in data) {data.expand = !data.expand;if (!data.expand && data.children) {this.collapse(data.children);}} else {this.$set(data, "expand", true);}},toggleExpand(data, val) {if (Array.isArray(data)) {data.forEach((item) => {this.$set(item, "expand", val);if (item.children) {this.toggleExpand(item.children, val);}});} else {this.$set(data, "expand", val);if (data.children) {this.toggleExpand(data.children, val);}}},NodeClick(e, data) {console.log(e)// e 为 eventconsole.log(data)// 当前项的所有详情 如：id label children},renderContent(h, data) {return (<div class="treeItem">{data.label}</div>)},}}
</script><style lang="less">
.org-tree-container {display: inline-block;padding: 15px;background-color: #fff;
}.org-tree {// display: inline-block;display: table;text-align: center;&:before, &:after {content: '';display: table;}&:after {clear: both;}
}.org-tree-node,
.org-tree-node-children {position: relative;margin: 0;padding: 0;list-style-type: none;&:before, &:after {transition: all .35s;}
}.org-tree-node-label {position: relative;display: inline-block;.org-tree-node-label-inner {padding: 10px 15px;text-align: center;border-radius: 3px;box-shadow: 0 1px 5px rgba(0, 0, 0, .15);}
}.org-tree-node-btn {position: absolute;top: 100%;left: 50%;width: 20px;height: 20px;z-index: 10;margin-left: -11px;margin-top: 9px;background-color: #fff;border: 1px solid #ccc;border-radius: 50%;box-shadow: 0 0 2px rgba(0, 0, 0, .15);cursor: pointer;transition: all .35s ease;&:hover {background-color: #e7e8e9;transform: scale(1.15);}&:before, &:after {content: '';position: absolute;}&:before {top: 50%;left: 4px;right: 4px;height: 0;border-top: 1px solid #ccc;}&:after {top: 4px;left: 50%;bottom: 4px;width: 0;border-left: 1px solid #ccc;}&.expanded:after {border: none;}
}.org-tree-node {padding-top: 20px;display: table-cell;vertical-align: top;&.is-leaf, &.collapsed {padding-left: 10px;padding-right: 10px;}&:before, &:after {content: '';position: absolute;top: 0;left: 0;width: 50%;height: 19px;}&:after {left: 50%;border-left: 1px solid #ddd;}&:not(:first-child):before,&:not(:last-child):after {border-top: 1px solid #ddd;}}.collapsable .org-tree-node.collapsed {padding-bottom: 30px;.org-tree-node-label:after {content: '';position: absolute;top: 100%;left: 0;width: 50%;height: 20px;border-right: 1px solid #ddd;}
}.org-tree > .org-tree-node {padding-top: 0;&:after {border-left: 0;}
}.org-tree-node-children {padding-top: 20px;display: table;&:before {content: '';position: absolute;top: 0;left: 50%;width: 0;height: 20px;border-left: 1px solid #ddd;}&:after {content: '';display: table;clear: both;}
}.horizontal {.org-tree-node {// display: flex;// flex-direction: row;// justify-content: flex-start;// align-items: center;display: table-cell;float: none;padding-top: 0;padding-left: 20px;&.is-leaf, &.collapsed {padding-top: 10px;padding-bottom: 10px;}&:before, &:after {width: 19px;height: 50%;}&:after {top: 50%;left: 0;border-left: 0;}&:only-child:before {top: 1px;border-bottom: 1px solid #ddd;}&:not(:first-child):before,&:not(:last-child):after {border-top: 0;border-left: 1px solid #ddd;}&:not(:only-child):after {border-top: 1px solid #ddd;}.org-tree-node-inner {display: table;}}.org-tree-node-label {display: table-cell;vertical-align: middle;}&.collapsable .org-tree-node.collapsed {padding-right: 30px;.org-tree-node-label:after {top: 0;left: 100%;width: 20px;height: 50%;border-right: 0;border-bottom: 1px solid #ddd;}}.org-tree-node-btn {top: 50%;left: 100%;margin-top: -11px;margin-left: 9px;}& > .org-tree-node:only-child:before {border-bottom: 0;}.org-tree-node-children {// display: flex;// flex-direction: column;// justify-content: center;// align-items: flex-start;display: table-cell;padding-top: 0;padding-left: 20px;&:before {top: 50%;left: 0;width: 20px;height: 0;border-left: 0;border-top: 1px solid #ddd;}&:after {display: none;}& > .org-tree-node {display: block;}}
}
</style>

3.效果

参考：
https://www.cnblogs.com/liliuyu/p/17534861.html
https://blog.csdn.net/LlanyW/article/details/127647395
https://blog.csdn.net/qq_36437172/article/details/133900466

4.不一次性加载全部数据，通过点击加号来实现

（1）添加属性isLoad ,true表示调用后端获取数据，false表示已经加载数据了，无需重新加载

{id: '1',label: "西部球队",isLoad:true,children: [{}]
},

（2）onExpand前面添加如下代码

onExpand(e, data) {if (data.isLoad){data.children=this.dtArr;data.isLoad=false;}
},

（3）toggleExpand 中添加 if (!item.isLoad) { } 判断

toggleExpand(data, val) {if (Array.isArray(data)) {data.forEach((item) => {if (!item.isLoad) {this.$set(item, "expand", val);if (item.children) {this.toggleExpand(item.children, val);}}});} else {if (!data.isLoad) {this.$set(data, "expand", val);if (data.children) {this.toggleExpand(data.children, val);}}}
},

（4）完整代码

<template><div ref="appContainer" class="app-container"><div style="margin-left:30px;"><el-row :gutter="20"><el-col :span="5"><el-switch v-model="horizontal" :width="50" active-text="横排" inactive-text="竖排" style="margin-top:8px;"/></el-col></el-row></div><div style="font-size:12px;margin-top:30px;"><vue2-org-tree:data="treeData":horizontal="!horizontal"collapsable:render-content="renderContent"@on-expand="onExpand"@on-node-click="NodeClick"/></div></div>
</template><script>
export default {name: "TreeTest",data() {return {horizontal:true,dtArr:[{id: '1-1',label: "勇士"},{id: '1-2',label: "火箭"},{id: '1-3',label: "太阳"},{id: '1-4',label: "小牛"}],treeData: {id: '0',label: "NBA季后赛",children: [{id: '1',label: "西部球队",isLoad:true,children: [{}]},{id: '2',label: "东部球队",children: [{id: '2-1',label: "热火"},{id: '2-2',label: "雄鹿"},{id: '2-3',label: "骑士"},{id: '2-4',label: "凯尔特人"}]}]}}},created() {this.toggleExpand(this.treeData, true);},methods: {collapse(list) {list.forEach((child) => {if (child.expand) {child.expand = false;}child.children && this.collapse(child.children);});},onExpand(e, data) {if (data.isLoad){data.children=this.dtArr;data.isLoad=false;}console.log(data, 'data')if ("expand" in data) {data.expand = !data.expand;if (!data.expand && data.children) {this.collapse(data.children);}} else {this.$set(data, "expand", true);}},toggleExpand(data, val) {if (Array.isArray(data)) {data.forEach((item) => {if (!item.isLoad) {this.$set(item, "expand", val);if (item.children) {this.toggleExpand(item.children, val);}}});} else {if (!data.isLoad) {this.$set(data, "expand", val);if (data.children) {this.toggleExpand(data.children, val);}}}},NodeClick(e, data) {console.log(e)// e 为 eventconsole.log(data)// 当前项的所有详情 如：id label children},renderContent(h, data) {return (<div class="treeItem">{data.label}</div>)},}}
</script><style lang="less">
.org-tree-container {display: inline-block;padding: 15px;background-color: #fff;
}.org-tree {// display: inline-block;display: table;text-align: center;&:before, &:after {content: '';display: table;}&:after {clear: both;}
}.org-tree-node,
.org-tree-node-children {position: relative;margin: 0;padding: 0;list-style-type: none;&:before, &:after {transition: all .35s;}
}.org-tree-node-label {position: relative;display: inline-block;.org-tree-node-label-inner {padding: 10px 15px;text-align: center;border-radius: 3px;box-shadow: 0 1px 5px rgba(0, 0, 0, .15);}
}.org-tree-node-btn {position: absolute;top: 100%;left: 50%;width: 20px;height: 20px;z-index: 10;margin-left: -11px;margin-top: 9px;background-color: #fff;border: 1px solid #ccc;border-radius: 50%;box-shadow: 0 0 2px rgba(0, 0, 0, .15);cursor: pointer;transition: all .35s ease;&:hover {background-color: #e7e8e9;transform: scale(1.15);}&:before, &:after {content: '';position: absolute;}&:before {top: 50%;left: 4px;right: 4px;height: 0;border-top: 1px solid #ccc;}&:after {top: 4px;left: 50%;bottom: 4px;width: 0;border-left: 1px solid #ccc;}&.expanded:after {border: none;}
}.org-tree-node {padding-top: 20px;display: table-cell;vertical-align: top;&.is-leaf, &.collapsed {padding-left: 10px;padding-right: 10px;}&:before, &:after {content: '';position: absolute;top: 0;left: 0;width: 50%;height: 19px;}&:after {left: 50%;border-left: 1px solid #ddd;}&:not(:first-child):before,&:not(:last-child):after {border-top: 1px solid #ddd;}}.collapsable .org-tree-node.collapsed {padding-bottom: 30px;.org-tree-node-label:after {content: '';position: absolute;top: 100%;left: 0;width: 50%;height: 20px;border-right: 1px solid #ddd;}
}.org-tree > .org-tree-node {padding-top: 0;&:after {border-left: 0;}
}.org-tree-node-children {padding-top: 20px;display: table;&:before {content: '';position: absolute;top: 0;left: 50%;width: 0;height: 20px;border-left: 1px solid #ddd;}&:after {content: '';display: table;clear: both;}
}.horizontal {.org-tree-node {// display: flex;// flex-direction: row;// justify-content: flex-start;// align-items: center;display: table-cell;float: none;padding-top: 0;padding-left: 20px;&.is-leaf, &.collapsed {padding-top: 10px;padding-bottom: 10px;}&:before, &:after {width: 19px;height: 50%;}&:after {top: 50%;left: 0;border-left: 0;}&:only-child:before {top: 1px;border-bottom: 1px solid #ddd;}&:not(:first-child):before,&:not(:last-child):after {border-top: 0;border-left: 1px solid #ddd;}&:not(:only-child):after {border-top: 1px solid #ddd;}.org-tree-node-inner {display: table;}}.org-tree-node-label {display: table-cell;vertical-align: middle;}&.collapsable .org-tree-node.collapsed {padding-right: 30px;.org-tree-node-label:after {top: 0;left: 100%;width: 20px;height: 50%;border-right: 0;border-bottom: 1px solid #ddd;}}.org-tree-node-btn {top: 50%;left: 100%;margin-top: -11px;margin-left: 9px;}& > .org-tree-node:only-child:before {border-bottom: 0;}.org-tree-node-children {// display: flex;// flex-direction: column;// justify-content: center;// align-items: flex-start;display: table-cell;padding-top: 0;padding-left: 20px;&:before {top: 50%;left: 0;width: 20px;height: 0;border-left: 0;border-top: 1px solid #ddd;}&:after {display: none;}& > .org-tree-node {display: block;}}
}
</style>

（5）效果