No!

You should NEVER load javascript over https on a page that was served over http.

It gives a false sense of security that doesn't exist.

Because the source page was served over http, the source page can be modified by an attacker, making the script be loaded under ssl makes you think its protected. But its not since an attacker could just modify the script tag to remove the https bit in transit then modify the script thats now being loaded over http.

In sort, forcing the script to use https gives you no gain when the page that includes it is served over http and it tricks you into thinking that javascript asset is secure.