在javascript中创建树的剪枝副本

function createPrunedCopy(node) {
  if (!node) {
    return null;
  }
  
  const newNode = {
    value: node.value,
    children: []
  };
  
  for (let i = 0; i < node.children.length; i++) {
    const childCopy = createPrunedCopy(node.children[i]);
    if (childCopy) {
      newNode.children.push(childCopy);
    }
  }
  
  return newNode;
}

// 示例用法
const tree = {
  value: 1,
  children: [
    {
      value: 2,
      children: [
        {
          value: 3,
          children: []
        },
        {
          value: 4,
          children: []
        }
      ]
    },
    {
      value: 5,
      children: []
    }
  ]
};

const prunedCopy = createPrunedCopy(tree);
console.log(prunedCopy);

     1
   /   \
  2     5
 / \
3   4

     1
   /
  2