Getting the current script executing filename in javascript

Okay, I've been searching for this for way too long already... I'm trying to find out how I can return the filename of the page that's running an included javascript, from inside that javascript.

I can easily do this in PHP using $_SERVER['SC开发者_运维问答RIPT_FILENAME'], but in Javascript this seems to be a lot harder.

Do I really need to substring it from location.href or is there a more efficient way? Could jQuery help?

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Remove the Url Parameters

function getFileName()
{
  var url = window.location.pathname;
  var lastUri = url.substring(url.lastIndexOf('/')+1);
  if(lastUri.indexOf('?')!= -1)
     return lastUri.substring(0,lastUri.indexOf('?'));
  else
     return lastUri;
}

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var url=location.href;
return url.substring(url.lastIndexOf('/')+1)