前端递归异步生成目录树需求，给定一个根节点id，每个节点都会发起异步请求，递归生成目录树letqueryTreeById=async(entityId='')=>{letresult=awaithttpRequst({method:"GET",path:"/admin/******?entityId="+entityId})//树格式lettree=result.map(({code,entityId,parentId,hasChild})=>({code,entityId,parentId,hasChild}))returntree}functionloadTree(item,result){//item当前节点信息，result为存储树结构数据的对象returnnewPromise((resolve,reject)=>{if(item.hasChild){//需要异步加载节点queryTreeById(item.entityId).then(list=>{result['children']=listletarr=[]list.forEach((item,index)=>{arr[index]=loadTree(result['children'][index],result['children'][index])});Promise.all(arr).then(values=>{返回resolve(values)})})}else{//子节点不需要异步加载到endthischildnodereturnresolve(result)}})}letobj={//最终结果用于加载数据children:[]}letrootInfo={entityId:134267,hasChild:true}//根节点信息loadTree（根信息o,obj).then(()=>{console.log('requestend')console.log(JSON.stringify(obj))})输出结果requestend{"children":[{"code":"表管理","entityId":134254,"parentId":134267,"hasChild":false},{"code":"test","entityId":134255,"parentId":134267,"hasChild":false},{"code":"加油站","entityId":134275,"parentId":134267,"hasChild":true,"children":[{"code":"加油站","entityId":134276,"parentId":134275,"hasChild":true,"children":[{"code":"喷嘴信息表","entityId":134277,"parentId":134276,"hasChild":false}]}]},{"code":"Barringdevicemotor","entityId":134278,"parentId":134267,"hasChild":true,"children":[{"code":"喷嘴信息表","entityId":134279，“parentId”：134278，“hasChild”：false}]}，{“code”：“Wall”，“entityId”：134268，“parentId”：134267，“hasChild”：true，“children”：[{"code":"基本墙","entityId":134269,"parentId":134268,"hasChild":true,"children":[{"code":"dsdds","entityId":134270,"parentId":134269,"hasChild":true,"children":[{"code":"hggj","entityId":134271，“parentId”：134270，“hasChild”：false}，{“代码”：“hggj2”，“entityId”：134272，“pachildren":[{"code":"Nozzleinformationtable","entityId":134277,"parentId":134276,"hasChild":false}]}]},{"code":"Barringdevicemotor","entityId":134278,"parentId":134267,"hasChild":true,"children":[{"code":"喷嘴信息表","entityId":134279,"parentId":134278,"hasChild":false}]},{"code":"Wall","entityId":134268,"parentId":134267,"hasChild":true,"children":[{"code":"BasicWall","entityId":134269,"parentId":134268,"hasChild":true,"children":[{"code":"dsdds","entityId":134270,"parentId":134269,"hasChild":true,"children":[{“code”：“hggj”，“entityId”：134271，“parentId”：134270，“hasChild”：false}，{“code”：“hggj2”，“entityId”：134272，“parentId”：134270，“有孩子”：假}]}]}]}]}
