如何从树形数据的末节点值回溯至根节点并拼接标签？

const treeData = [{
    label: "节点1",
    value: "1",
    children: [{
        label: "节点1-1",
        value: "1-1",
    }, {
        label: "节点1-2",
        value: "1-2",
    }]
}, {
    label: "节点2",
    value: "2",
    children: [{
        label: "节点2-1",
        value: "2-1",
    }]
}];

function getPathLabel(treeData, targetValue) {
  function traverse(node) {
    if (node.value === targetValue) {
      return [node.label];
    }
    if (node.children) {
      for (let child of node.children) {
        let path = traverse(child);
        if (path) {
          return [node.label, ...path];
        }
      }
    }
    return null;
  }

  for (let node of treeData) {
    let path = traverse(node);
    if (path) {
      return path.join("/");
    }
  }
  return null; // Target value not found
}


let pathLabel = getPathLabel(treeData, "1-2");
console.log(pathLabel); // Output: 节点1/节点1-2

pathLabel = getPathLabel(treeData, "2-1");
console.log(pathLabel); // Output: 节点2/节点2-1

pathLabel = getPathLabel(treeData, "3-1"); //value不存在
console.log(pathLabel); // Output: null