若无此模块则在anaconda下安装 nbextensions
pip install jupyter_contrib_nbextensions jupyter contrib nbextension install --user pip install jupyter_nbextensions_configurator
安装完成后重新启动 jupyter Notebook， 就可以看到nbextension 标签了。
2.勾选时间显示的小组件若无上面组件下载后勾选
pip install jupyter_contrib_nbextensions jupyter contrib nbextension install --user jupyter nbextension enable execute_time/Exec3.显示效果如下
