话不多说，直接贴代码

<template>
<div class="custom-tree-container">
<!-- <p>Using render-content</p>
<el-tree style="max-width: 600px" :data="dataSource" show-checkbox node-key="id" default-expand-all
:expand-on-click-node="false" :render-content="renderContent" /> -->
<p>Using scoped slot</p>
<el-tree style="max-width: 600px" :data="dataSource" show-checkbox node-key="id" default-expand-all
:expand-on-click-node="false">
<template #default="{ node, data }">
<span class="custom-tree-node">
<span>{{ node.label }}</span>
<span>
<a @click="append(data)"> Append </a>
<a style="margin-left: 8px" @click="remove(node, data)"> Delete </a>
</span>
</span>
</template>
</el-tree>
</div>
</template>
<script>
import { reactive, ref, toRefs } from 'vue'
// import {Node} from 'element-plus/es/components/tree/src/model/node'
export default {
name: 'part',
setup() {
const state = reactive({
dataSource: [
{
id: 1,
label: 'Level one 1',
children: [
{
id: 4,
label: 'Level two 1-1',
children: [
{
id: 9,
label: 'Level three 1-1-1'
}
]
}
]
}
]
})
const append = (data) => {
let treeNodeId = data.$treeNodeId;
console.info(data)
// alert('当前id'+data.id)
// alert(data.$treeNodeId)
let id =data.id*100+1
const newChild = { id: id, label: data.label+'-'+id, children: [] };
if (!data.children) {
data.children = [];
}
data.children.push(newChild);
// state.dataSource = [data];
}
const remove = (node, data) => {
const parent = node.parent;
const children = parent.data.children || parent.data;
const index = children.findIndex(d => d.id === data.id);
children.splice(index, 1);
// dataSource.value = [...dataSource.value];
};
return {
...toRefs(state),
append,
remove
}
}
}
</script>
<style>
.custom-tree-node {
flex: 1;
display: flex;
align-items: center;
justify-content: space-between;
font-size: 14px;
padding-right: 8px;
}
</style>

效果如下