Finally, you benefit that since your users are downloading the JQuery library from Google, they’re not downloading it from you. Most people don’t ever hit their bandwidth limitations from their web hosts, but if you have a content heavy site, saving 30 KB worth of bandwidth per visitor can add up pretty quickly.
How to do it:
Here’s how to do it the way Google suggests:
// Place init code here instead of $(document).ready()
Alternatively, you can do a good old fashioned script reference: