若后端传回如下数据

[{name:'一级目录',id:'1',parentId:'0'},{name:'一级目录',id:'2',parentId:'0'},{name:'二级目录',id:'3',parentId:'1'},{name:'二级目录',id:'4',parentId:'2'},{name:'三级目录',id:'5',parentId:'3'}]

你要将其转为tree的结构。如何做呢？

function toTree(data,pid){		let res=[],temp;		for(var i in data){			if(data[i].parentId == pid){				res.push(data[i])				temp = toTree(data,data[i].id);				if(temp.length>0){					data[i].children=temp				}			}		}				return res;	}	console.log(toTree(list,0))