How to add directory plug-ins to jubyter notebook

This part of the content is in accordance with the experience of baidu on the operation of the article records, in accordance with the steps of the operation can be, there is no problem. The article addresses is:
The steps are as follows:

    first close the running jupyter notebook plug-in package:
pip3 install jupyter_contrib_nbextensions
    configuration nbextension:

       jupyter contrib nbextension install --user --skip-running-check


      is equipped, we launch jupyter; at that moment, we see the nbexlogo appearing on the menu bar, that is, the installation is successful; and then, we click on the configuration to enter nbexschematic; and we see that there are many items; after the modification, click on TableOfContents to update the webpage or restart jupyter; that is,

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