js 树转数组

function treeToArr(data) {
  const result = [];
  data.forEach(item => {
      const loop = data => {
          result.push({
            id: data.id,
            name: data.name,
            parentId: data.parentId
          });
          let child = data.children
          if(child){
            for(let i = 0; i < child.length; i++){
              loop(child[i])
            }
          }
      }
      loop(item);
  })
  return result;
}