当前需求:层级列表中选中某个元素,则获取最底层子集id,并用逗号连接(1,2,3,4,5);

数据形式:

let data = [{
            id:"1",
            children:[{
                id:"11",
                children:[{
                    id:"111",
                    children:null
                },
                {
                    id:"112",
                    children:null
                },
                {
                    id:"113",
                    children:null
                }]
            },
            {
                id:"12",
                children:[{
                    id:"121",
                    children:null
                },
                {
                    id:"122",
                    children:null
                },
                {
                    id:"123",
                    children:null
                }]
            }]

        }];

遍历方法可参考:https://blog.csdn.net/chaos_h…，写的很详细
具体操作：首先找到选择元素的id在树形数据中的位置，并获取他

找寻id相同的的元素

findSameId(tree, id) {
            let isGet = false;
            let retNode = null;
            function deepSearch(tree, id) {
                for (var i = 0; i < tree.length; i++) {
                    if (tree[i].children && tree[i].children.length > 0) {
                        deepSearch(tree[i].children, id);
                    }
                    if (id === tree[i].id || isGet) {
                        isGet || (retNode = tree[i]);
                        isGet = true;
                        break;
                    }
                }
            }
            deepSearch(tree, id);
            return retNode;
        };

找寻他的最底层子元素，也就是所有没有子集的元素

找当前id的子元素的id

findChildId(data) {
            console.log(data, 678);
            console.log(data.children, 678);

            if (data.children !== null) {
                for (let i = 0; i < data.children.length; i++) {
                    console.log(data.children[i], i);
                    const childrens = data.children[i];

                    if (childrens.hasOwnProperty("children") && childrens.children && childrens.children.length !== 0) {
                        console.log('-------');

                        console.log(childrens, i);
                        console.log('-------');

                        this.findChildId(childrens);
                    } else {
                        this.sideIds.push(childrens.id);
                    }
                   
                }
            } else {
                this.sideIds.push(data.id);
            }
        }

### 由于本身是vue下的处理 handleSelectDept是触发点击获取到对应id; this.sideIds是本身在data里里定义了的

data(){
            return{
                sideIds:[]
            }
        }

触发效果

handleSelectDept(key) {
            this.sideIds = [];//每次点击需要把本身的sideIds清空
            const dataId = this.findSameId(this.treeData, key);
            this.findChildId(dataId);
            console.log(this.sideIds, 9999)
            this.$set(this.queryForm, 'depIds', this.sideIds.join(","));
            console.log(this.queryForm, 989);
            this.getTableData();
        }