油猴脚本：查Linux升级差额

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[/url]Preamble
This script is built upon the foundations of two existing scripts, adding display functionality for the transition from level 0 to level 1, and from level 1 to level 2.
[url=#h-2]Note:

The transition from level 0 to level 1 hasn't been tested (since no level 0 users were found initially), but it has now been verified.

For the transition from level 2 to level 3 and beyond, please use the Qin Shi Huang API at connect.linux.do.

[/url]Acknowledgments
Thanks to [url=/u/_y1]@_y1 for unknowingly serving as a test subject for the display of the transition from level 1 to level 2.