SOURCE

const data = [{
    id: '1',
    name: 'test1',
    children: [
        {
            id: '11',
            name: 'test11',
            children: [
                {
                    id: '111',
                    name: 'test111'
                },
                {
                    id: '112',
                    name: 'test112'
                }
            ]

        },
        {
            id: '12',
            name: 'test12',
            children: [
                {
                    id: '121',
                    name: 'test121'
                },
                {
                    id: '122',
                    name: 'test122'
                }
            ]
        }
    ]
}];
function bfs(target, id) {
  const quene = [...target]
  console.log('ddd:'+JSON.stringify(quene))
  do {
    const current = quene.shift()
    if (current.children) {
      quene.push(...current.children.map(x => ({ ...x, path: (current.path || current.id) + '-' + x.id })))
    }
    if (current.id === id) {
      console.log('AAA：'+ JSON.stringify(quene))
      return current
    }
  } while(quene.length)
  return undefined
}
console.log(bfs(data,'1'))