It’s too bad that I can not write and practice JavaScript on my website which is provided by sites.psu.edu. On the other hand, I can save a html file with JavaScript in PASS which is also provide by psu and link to that page via sites.psu.edu. Because JavaScript is forbidden for security reasons, I loss a lot of fun on creating my own WordPress.

Reference:

http://sites.psu.edu/docs/embedding-uploading-content/code/