Assuming that the credentials are filled in by the browser, this script clicks the big red button for you.
If you have a basic understanding of JavaScript, a brief glance will let you know that this script does nothing but clicking the big red button to log into PKU IAAA interface. If you do not, a little time spent reading the words in the code also helps you see that the script is too short to hide any malicious logic in it.
The premise is that you are willing to use your browser's automatic filling function to help you fill in your ID and password. This allows the script to not store any information about you, making it safer.
Just install it using any script manager and visit a PKU website that asks you to log in. When the browser fills in your credentials, you will be logged in as if you have clicked the button.
No. This script only simulates a button click and has no impact on data exchange with the PKU server. In fact, the server is completely unaware of the fact that you installed this script, only to find that you made a faster click.
