前端项目实战叁佰伍拾柒react-admin和material ui-RcTree判断数据是否存在

 <div>
                <style dangerouslySetInnerHTML={{ __html: STYLE }} />
                {TreeDataList.length>0?(
                     <Tree
                     defaultExpandAll={true}
                     defaultExpandedKeys={[]}
                     motion={motion}
                     onSelect={onSelect}
                       treeData={TreeDataList}
                 />
                ):null}
            </div>