SOURCE

cola(function(model){
 model.dataType({
            name: "Node",
            properties: {
                nodes: {
                    dataType: "Node",
                    provider: {
                        url: "http://open-data.cola-ui.com/service/district/children",
                        parameter: {
                            parentId: "{{@id}}"
                        }
                    }
                }
            }
        });
        model.action({
            getName: function(node) {
                return node.get("isDir") ? "文件夹" : "文件"
            }
        })

        model.describe("nodes", {
            dataType: "Node",
            provider: "http://open-data.cola-ui.com/service/district/provinces"
        });

        model.widgetConfig({
            fileTree: {
                bind: {
                    hasChildProperty: "isDir",
                    expression: "node in nodes",
                  textProperty:"name",
                    child: {
                        recursive: true,
                        hasChildProperty: "isDir",
                       textProperty:"name",
                        expression: "node in node.nodes"
                    }
                },
                height: "100%"
            }
        });
})

<c-tree  id="fileTree"></c-tree>
<br>