jupyter notebook启动后浏览器一片空白，刷新页面后，提示网页不存在，谁知道是什么情况？



CMD中运行的记录也没有提示报错信息：
C:\Users\hemengjun>jupyter notebook
[I 20:08:47.778 NotebookApp] Serving notebooks from local directory: C:\Users\he
mengjun
[I 20:08:47.778 NotebookApp] 0 active kernels
[I 20:08:47.778 NotebookApp] The Jupyter Notebook is running at:
[I 20:08:47.778 NotebookApp] http://localhost:8888/?token=71f388187af361925b94d8
0759d236d224d356e3b0d81d1f
[I 20:08:47.778 NotebookApp] Use Control-C to stop this server and shut down all
kernels (twice to skip confirmation).
[C 20:08:47.793 NotebookApp]

    Copy/paste this URL into your browser when you connect for the first time,
    to login with a token:
        http://localhost:8888/?token=71f388187af361925b94d80759d236d224d356e3b0d
81d1f
[I 20:08:51.413 NotebookApp] Accepting one-time-token-authenticated connection f
rom ::1
[W 20:08:51.998 NotebookApp] 404 GET /i18n/zh-CN/LC_MESSAGES/nbjs.json?v=2017102
6200846 (::1) 12.50ms referer=http://localhost:8888/undefined/tree