带有上下级关系的数据改为树形菜单的数据

let treeid = 0 //初始为一级列表，默认id为0
let treedata = []
let list = {
id: 1,
name: "名称",
pid: 0,
    //所要更改的数据
}
changeTree(list,treeid,reedata)
const changeTree = (datalist, id, newArr) => {
  for (let i = 0; i < datalist.length; i++) {
    if (datalist[i].pid == id) {
      newArr.push(datalist[i]);
    }
  }
  for (let i = 0; i < newArr.length; i++) {
    newArr[i].children = [];
    changeTree(scenicList.value, newArr[i].id, newArr[i].children);
    if (newArr[i].children.length == 0) {
      delete newArr.children;
    }
  }
};