You need diagnostics - why is it not displaying?
Try typing in the url "http://xxx/xxx.js" into the browser to see what it says. Might
be "404: not found" or "403: forbidden" etc.
You can't fix a problem without knowing what is causing it; diagnosis is the most
important part of the fixing process, and randomly attempting various solutions in the
hope that one of them fixes it is not the way to go.