export和export default

var getFlatData=1, jdTree2AntdTree=2,appendNewId=3
export { getFlatData, jdTree2AntdTree,appendNewId }

var getFlatData=1
export default getFlatData

import { getFlatData, jdTree2AntdTree, appendNewId } from '../../../utils/treeop.js'

import GradingView from '../../pages/grading';

 这几行是典型的模块化的代码片段。还是构建和解构的过程。