The jQuery library contains the following features:
- HTML/DOM manipulation
- CSS manipulation
- HTML event methods
- Effects and animations
There are two versions of jQuery available for downloading:
- Production version – this is for your live website because it has
been minified and compressed.
- Development version – this is for testing and development
(uncompressed and readable code).
<head> <script src="https://stackoverflow.com/questions/40409660/jquery-3.1.1.min.js"></script> </head>
If you don’t want to download and host jQuery yourself, you can include it from a CDN (Content Delivery Network).
Both Google and Microsoft host jQuery.
To use jQuery from Google or Microsoft, use one of the following:
<head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> </head>
<head> <script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.1.1.min.js"></script> </head>
One big advantage of using the hosted jQuery from Google or Microsoft:
Many users already have downloaded jQuery from Google or Microsoft when visiting another site. As a result, it will be loaded from cache when they visit your site, which leads to faster loading time. Also, most CDN’s will make sure that once a user requests a file from it, it will be served from the server closest to them, which also leads to faster loading time.
You can learn more about JQuery from http://www.w3schools.com/jquery/default.asp