.tree#tree
    details(open="true" style="direction: ltr;")
        summary
            span.tree-item sad
            a.op(href="") 新建
        details(open="true")
            summary
                span.tree-item sad
                a.op(href="") 新建
            details
                summary
                    span.tree-item.tree-md-file 
                        div(style="flex: 1;width: 0;white-space: nowrap;text-overflow: ellipsis;overflow: hidden;") asda
                    a.op(href="") 新建
        details
            summary
                span.tree-item.tree-md-file 
                    div(style="flex: 1;width: 0;white-space: nowrap;text-overflow: ellipsis;overflow: hidden;") asda
                a.op(href="") 新建
        details
            summary
                span.tree-item.tree-md-file.active
                    div(style="flex: 1;width: 0;white-space: nowrap;text-overflow: ellipsis;overflow: hidden;") asda
                a.op(href="") 新建