js树形结构，根据关键字（id）查找节点路径

 const root = [{
        id: 1,
        child: [
            {
                id: 2,
                child: [
                    {
                        id: 4,
                        child: []
                    },
                    {
                        id: 5,
                        child: []
                    }
                ]
            },
            {
                id: 3,
                child: [
                    {
                        id: 6,
                        child: []
                    },
                    {
                        id: 7,
                        child: []
                    }
                ]
            }

        ]
    }]

function findPathbyId(tree,id,path){
    if(typeof path=='undefined'){
        path=[]
    }
    for(var i=0;i<tree.length;i++){
        var tempPath=[...path]
        tempPath.push(tree[i].id)
        if(tree[i].id==id){
            return tempPath
        }
        if(tree[i].child){
            let reuslt=findPathbyId(tree[i].child,id,tempPath)
            if(reuslt){
                return reuslt
            }
        }
    }
}
findPathbyId(root,6)