Adapted for version 3 of Unified Authentication

Related:

#10
#11

Credits to @zeroHYH !

The unified identity authentication login page has updated login.js to version 3 (https://pass.sdu.edu.cn/cas/comm/sdu/js/login.js?v=3.0) recently, causing the v0.3 version of this script to break. The v0.4 major update has fixed the problem within 24 hours.