How to use javascript to get the file name _ javascript in the website

How to Use JS to obtain the file name in the URL encountered this problem when writing an image adaptive size function ......
Well, the problem is not much said. Another stone came into being on the way to solve the problem, that is, how to use JS to get the image file name.
After thinking about N for a long time, I finally wrote a function ....
First added to favorites for later use.

Script var a = "http://www.jb51.net/html/images/logo.gif"; var B =. split ("/"); var c = B. slice (B. length-1, B. length ). toString (String ). split (". "); alert (" the obtained file name is: "+ c. slice (0, 1); script
[Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute]