How to determine if a javascript was already loaded by other html file

Question

How to determine if a javascript was already loaded by other html file? I want to reduce the redundant loading of the javascript files to decrease the loading time of my webpage

Answer 1

If your web server is providing correct caching headers this shouldn't be necessary, the browser will cache the javascript file across multiple requests.

You might want to check out the YDN page Best Practices for Speeding Up Your Web Site