i deleted 8 large javascript codes from my blog and nothing happened, how this will effect my blog?

Hi,

I just found a new way to host css and java codes in files to blogspot blog,
when i start moving them i deleted them from the blog to host them in .js files
but when i saved and tired to look what effect will happen to my blog i saw nothing happened

i don't know a lot about javascript codes

so how i know what those 8 large codes doing in my blog,
and how i know the differences between keeping or deleting them?

thank you.