实现逻辑：给默认选中节点的所有子节点添加一个disabled属性，以此禁用子节点。
编写代码
<template><el-tree :props="{ children: 'children', label: 'name' }" :data="treeListData" show-checkbox node-key="id" ref="treeRef"check-strictly :default-expand-all="true" :default-checked-keys="checkedIdArr" @check-change="handleCheckChange" />
</template><script lang="ts">
import { toRefs, reactive, onMounted, defineComponent, getCurrentInstance } from 'vue';export default defineComponent({setup() {// 页面加载时onMounted(() => {data.treeListData = setSubDisabled(data.treeListData, data.checkedIdArr)});const { proxy }: any = getCurrentInstance();const data = reactive({treeListData: [{id: 1,name: "一级1",pid: 0,is_level: 1,children: [{id: 2,name: "二级1",pid: 1,is_level: 2,children: [{id: 9,name: "三级1",pid: 1,is_level: 3,}]}]},{id: 3,name: "一级2",pid: 0,is_level: 1,children: [{id: 4,name: "二级1",pid: 3,is_level: 2,children: [{id: 5,name: "三级1",pid: 4,is_level: 3,children: [{id: 6,name: "四级1",pid: 5,is_level: 4,children: [{id: 7,name: "五级1",pid: 6,is_level: 5,}]}]}]},{id: 8,name: "二级2",pid: 3,is_level: 2,}]},] as any[],checkedIdArr: [1, 4]});function setSubDisabled(nodes: any[], checkedIdArr: number[]) {nodes.forEach((node: any) => {if (checkedIdArr.includes(node.id)) {function setDisabled(sonNode: any[]) {sonNode && sonNode.forEach((v: any) => {v.disabled = trueif (v.children && v.children.length > 0) {setDisabled(v.children)}})}setDisabled(node.children)}if (node.children && node.children.length > 0) {setSubDisabled(node.children, checkedIdArr);}})return nodes}const handleCheckChange = (curObj: any, checked: boolean,) => {let getCheckedKeys = proxy.$refs.treeRef.getCheckedKeys()let newArr = disableSubNodes(curObj.children, checked, getCheckedKeys)data.checkedIdArr = newArrproxy.$refs.treeRef.setCheckedKeys(newArr)}const disableSubNodes = (nodes: any, checked: boolean, checkedKeys: number[]) => {nodes?.length > 0 && nodes.forEach((node: any) => {checkedKeys = checkedKeys.filter((v: number) => v !== node.id)node.disabled = checked;if (node.children && node.children.length > 0) {disableSubNodes(node.children, checked, checkedKeys);}});return checkedKeys}return {...toRefs(data), handleCheckChange};},
});
</script>效果图
