function findParents(treeData,id){
  if(treeData.length==0) return
  for(let i=0;i<treeData.length;i++){
    if(treeData[i].id == id){
      return []
    }else{
      if(treeData[i].children){
        let res = findParents(treeData[i].children,id)
        if(res !== undefined){
          return res.concat(treeData[i].id)