element ui 树形表格获得索引路径

getPathByKey (value, key, arr) {
                //测试数据
                let temppath = [];
                let realPath = ""
                try {
                    function getNodePath(node,index) {
                        temppath.push(index);
                        //找到符合条件的节点，通过throw终止掉递归
                        if (node[key] === value) {
                            temppath.forEach((v, i) => {
                                if (i == 0) {
                                    realPath += "." + v
                                } else {
                                    realPath += `.children.${v}`
                                }
                            })
                            // temppath = temppath.join(",")
                            throw ("GOT IT!");
                            // return;
                        }
                        if (node.children && node.children.length > 0) {
                            for (var i = 0; i < node.children.length; i++) {
                                getNodePath(node.children[i],i);
                            }
                            //当前节点的子节点遍历完依旧没找到，则删除路径中的该节点
                            temppath.pop();
                        } else {
                            //找到叶子节点时，删除路径当中的该叶子节点
                            temppath.pop();
                        }
                    }
                    for (let i = 0; i < arr.length; i++) {
                        getNodePath(arr[i],i);
                    }
                } catch (e) {
                    return realPath;
                }
            },