function multiFilterTree(tree, name, isOpen) {
  const filteredNodes = [];
  for (const node of tree) {
    const isNameMatch = name === null || (typeof name === 'string' && node.name.includes(name));
    const isOpenMatch = isOpen === null || node.isOpen === isOpen;

    if (isNameMatch && isOpenMatch) {
      const children = multiFilterTree(node.children, name, isOpen);
      filteredNodes.push({ ...node, children: children.length > 0 ? children : [] });
    } else {
      const children = multiFilterTree(node.children, name, isOpen);
      if (children.length > 0) {
        filteredNodes.push({ ...node, children });
      }
    }
  }
  return filteredNodes;
}

// 使用示例
const filteredNodes = multiFilterTree(treeData, 'a', true);
console.log(filteredNodes);