js根据结构路径拼成对应的数据结构

在处理前端中树形结构的数据时，将多个同级数据根据设计好的路径拼成相应的结构

var arr = ["N0|C0|P0","N0|C0|P1","N0|C1|P2"];
            
            function parsePath(paths){
                var map = new Map();
                var rootNode = null;
                for(var j = 0,len=paths.length;j<len;j++){
                    var parentNode = null;
                    var pathArray = paths[j].split("|");
                    for(var i = 0;i<pathArray.length;i++){
                        var id = pathArray[i];
                        var node = map.get(id);
                        if(node == null){
                            var obj = {};
                            obj.flag = id;
                            obj.children = [];
                            map.set(id,obj);
                            node=obj;
                        }
                        if(j==0&&i==0){
                            rootNode=node;
                        }
                        if(parentNode!=null){
                            if(contains(parentNode.children,id)){
                                
                            }else{
                                parentNode.children.push(node)
                            }
                        }
                        parentNode = node
                    }
                }
                console.log(rootNode)
            }
            
            parsePath(arr)
            
            function contains(children,b){
                for(var i = 0;i<children.length;i++){
                    var id = children[i].flag;
                    if(id == b){
                        return true;
                        break;
                    }
                }
                return false;
            }