jsはlayui tree選択のidを取得します.

            
 function getChildNodes(treeNode, result) {
            for (var i in treeNode) {
                result.push(treeNode[i].id);
                result = getChildNodes(treeNode[i].children, result);
            }
            return result;
        }

var checkedData = tree.getChecked('roletree'); //         
 var role = getChildNodes(checkedData,[]);