Jupyter 小部件未出现在笔记本中

我正在运行 jupyter 笔记本，但 jupyter 小部件没有出现。相反，我收到以下消息：

Failed to display Jupyter Widget of type Button.
If you're reading this message in the Jupyter Notebook or JupyterLab Notebook, it may mean that the widgets JavaScript is still loading. If this message persists, it likely means that the widgets JavaScript library is either not installed or not enabled. See the Jupyter Widgets Documentation for setup instructions.
If you're reading this message in another frontend (for example, a static rendering on GitHub or NBViewer), it may mean that your frontend doesn't currently support widgets.

我有以下版本：

widgetsnbextension (3.0.8)
ipywidgets (7.0.5)

我使用以下命令安装了小部件：

pip install ipywidgets
jupyter nbextension enable --py widgetsnbextension

我的代码也是：

import ipywidgets as widgets
from IPython.display import display

button = widgets.Button(description='Hello')
display(button)

我有相同的版本，代码适合我。 在启动 Jupyter Notebook 之前。你尝试执行吗？：

jupyter nbextension enable --py widgetsnbextension --sys-prefix

输出==>

Enabling notebook extension jupyter-js-widgets/extension...
         - Validating: ok

** http://ipywidgets.readthedocs.io/en/stable/user_install.html http://ipywidgets.readthedocs.io/en/stable/user_install.html使用 pip 显示安装说明。指定在使用虚拟环境时使用此模式。