SOURCE

function filterTree(tree, key) {
  return tree.map(item => {
    if (item.type === 'user') {
      if (item.title.includes(key)) {
        return item;
      } else {
        return null;
      }
    } else if (item.type === 'organization' && item.children) {
      const filteredChildren = filterTree(item.children, key).filter(Boolean);
      if (filteredChildren.length > 0) {
        return { ...item, children: filteredChildren };
      } else {
        return null;
      }
    }
  }).filter(Boolean);
}

const tree = [
  {
    title: '公司名',
    type: 'organization',
    children: [
      {
        title: 'FE',
        type: 'organization',
        children: [
          { title: 'wells', type: 'user' },
          { title: 'Harrison', type: 'user' },
        ],
      },
      {
        title: 'joe',
        type: 'user',
      },
    ],
  },
  {
    title: '其他',
    type: 'organization',
    children: [
      { title: 'jason', type: 'user' },
      { title: 'jack', type: 'user' },
    ],
  },
];

const key = 'j';

const newTree = filterTree(tree, key);
console.log(newTree);